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regex is a template tag that extends JavaScript regular expressions with key features from other leading regex libraries that make regexes more powerful and dramatically more readable. It returns native RegExp instances that run with native performance, and can exceed the performance of regex literals you'd write yourself. It's also lightweight, has no dependencies, supports all ES2025 regex features, has built-in TypeScript declarations, and can be used as a Babel plugin to avoid any runtime dependencies or user runtime cost.

Highlights include support for free spacing and comments, atomic groups via (?>…) and possessive quantifiers (e.g. ++) that can help you avoid ReDoS, subroutines via \g<name> and subroutine definition groups via (?(DEFINE)…) that enable powerful subpattern composition, and context-aware interpolation of regexes, escaped strings, and partial patterns.

With the regex library, JavaScript steps up as one of the best regex flavors alongside PCRE and Perl, possibly surpassing C++, Java, .NET, Python, and Ruby.

💎 Features

• A modern regex baseline so you don't need to continually opt-in to best practices.
  • Always-on flag <kbd>v</kbd> gives you the best level of Unicode support and strict errors.
  • New flags:
    • Always-on flag <kbd>x</kbd> allows you to freely add whitespace and comments to your regexes.
    • Always-on flag <kbd>n</kbd> (named capture only mode) improves regex readability and efficiency.
  • No unreadable escaped backslashes \\\\ since it's a raw string template tag.
• Extended regex syntax.
  • Atomic groups and possessive quantifiers can dramatically improve performance and prevent ReDoS.
  • Subroutines and definition groups enable powerful composition, improving readability and maintainability.
  • Recursive matching is enabled by a plugin.
• Context-aware and safe interpolation of regexes, strings, and partial patterns.
  • Interpolated strings have their special characters escaped.
  • Interpolated regexes locally preserve the meaning of their own flags (or their absense), and their numbered backreferences are adjusted to work within the overall pattern.

🪧 Examples

import {regex, pattern} from 'regex';

// Subroutines and subroutine definition group
const record = regex`
  ^ Admitted:\ (?<admitted> \g<date>) \n
    Released:\ (?<released> \g<date>) $

  (?(DEFINE)
    (?<date>  \g<year>-\g<month>-\g<day>)
    (?<year>  \d{4})
    (?<month> \d{2})
    (?<day>   \d{2})
  )
`;

// Atomic group: Avoids ReDoS from the nested, overlapping quantifier
const words = regex`^(?>\w+\s?)+$`;

// Context-aware and safe interpolation
const re = regex('m')`
  # Only the inner regex is case insensitive (flag i)
  # Also, the outer regex's flag m is not applied to it
  ${/^a.b$/i}
  |
  # Strings are contextually escaped and repeated as complete units
  ^ ${'a.b'}+ $
  |
  # This string is contextually sandboxed but not escaped
  ${pattern('^ a.b $')}
`;

// Numbered backreferences in interpolated regexes are adjusted
const double = /(.)\1/;
regex`^ (?<first>.) ${double} ${double} $`;
// → /^(?<first>.)(.)\2(.)\3$/v

🕹️ Install and use

npm install regex

import {regex, pattern} from 'regex';

In browsers:

<script type="module">
  import {regex, pattern} from 'https://cdn.jsdelivr.net/npm/regex@4.3.2/+esm';
  // …
</script>

<script src="https://cdn.jsdelivr.net/npm/regex@4.3.2/dist/regex.min.js"></script>
<script>
  const {regex, pattern} = Regex;
</script>

❓ Context

Due to years of legacy and backward compatibility, regular expression syntax in JavaScript is a bit of a mess. There are four different sets of incompatible syntax and behavior rules that might apply to your regexes depending on the flags and features you use. The differences are just plain hard to fully grok and can easily create subtle bugs.

Additionally, JavaScript regex syntax is hard to write and even harder to read and refactor. But it doesn't have to be that way! With a few key features — raw multiline strings, insignificant whitespace, comments, subroutines, subroutine definition groups, interpolation, and named capture only mode — even long and complex regexes can be beautiful, grammatical, and easy to understand.

regex adds all of these features and returns native RegExp instances. It always uses flag <kbd>v</kbd> (already a best practice for new regexes) so you never forget to turn it on and don't have to worry about the differences in other parsing modes (in environments without native <kbd>v</kbd>, flag <kbd>u</kbd> is automatically used instead while applying <kbd>v</kbd>'s escaping rules so your regexes are forward and backward compatible). It also supports atomic groups and possessive quantifiers to help you avoid catastrophic backtracking. And it gives you best-in-class, context-aware interpolation of RegExp instances, escaped strings, and partial patterns.

🦾 Extended regex syntax

Historically, JavaScript regexes were not as powerful or readable as other major regex flavors like Java, .NET, PCRE, Perl, Python, and Ruby. With recent advancements and the regex library, those days are over. Modern JavaScript regexes have significantly improved, adding lookbehind, named capture, Unicode properties, set subtraction and intersection, etc. The regex library, with its extended syntax and implicit flags, adds the key remaining pieces needed to stand alongside or surpass other major flavors.

Atomic groups

Atomic groups are noncapturing groups with special behavior, and are written as (?>…). After matching the contents of an atomic group, the regex engine automatically throws away all backtracking positions remembered by any tokens within the group. Atomic groups are most commonly used to improve performance, and are a much needed feature that regex brings to native JavaScript regular expressions.

Example:

regex`^(?>\w+\s?)+$`

This matches strings that contain word characters separated by spaces, with the final space being optional. Thanks to the atomic group, it instantly fails to find a match if given a long list of words that end with something not allowed, like 'A target string that takes a long time or can even hang your browser!'.

Try running this without the atomic group (as /^(?:\w+\s?)+$/) and, due to the exponential backtracking triggered by the many ways to divide the work of the inner and outer + quantifiers, it will either take a very long time, hang your browser/server, or throw an internal error after a delay. This is called catastrophic backtracking or ReDoS, and it has taken down major services like Cloudflare and Stack Overflow. regex and atomic groups to the rescue!

const re = regex('gis')`<b>.*?</b>!`;

// This is OK
'<b>Hi</b>! <b>Bye</b>.'.match(re);
// → ['<b>Hi</b>!']

// But not this
'<b>Hi</b>. <b>Bye</b>!'.match(re);
// → ['<b>Hi</b>. <b>Bye</b>!'] 👎

const re = regex('gis')`<b>(?>.*?</b>)!`;

'<b>Hi</b>. <b>Bye</b>!'.match(re);
// → ['<b>Bye</b>!'] 👍

[!NOTE] Atomic groups are supported in many other regex flavors. There's a proposal to add them to JavaScript.

Possessive quantifiers

Possessive quantifiers are created by adding + to a quantifier, and they're similar to greedy quantifiers except they don't allow backtracking. Although greedy quantifiers start out by matching as much as possible, if the remainder of the regex doesn't find a match, the regex engine will backtrack and try all permutations of how many times the quantifier should repeat. Possessive quantifiers prevent the regex engine from doing this.

Possessive quantifiers are syntactic sugar for atomic groups when their contents are a single repeated item (which could be a token, character class, or group).

Like atomic groups, possessive quantifiers are mostly useful for performance and preventing ReDoS, but they can also be used to eliminate certain matches. For example, regex`a++.` matches one or more a followed by a character other than a. Unlike /a+./, it won't match a sequence of only a characters like 'aaa'. The possessive ++ doesn't give back any of the as it matched, so there's nothing left for the following . to match.

Here's how possessive quantifier syntax compares to the greedy and lazy quantifiers that JavaScript supports natively:

Fixed repetition quantifiers behave the same whether they're greedy {2}, lazy {2}?, or possessive {2}+.

[!NOTE] Possessive quantifiers are supported in many other regex flavors. There's a proposal to add them to JavaScript.

Subroutines

Subroutines are written as \g<name> (where name refers to a named group), and they treat the referenced group as an independent subpattern that they try to match at the current position. This enables subpattern composition and reuse, which improves readability and maintainability.

The following example illustrates how subroutines and backreferences differ:

// A backreference with \k<name>
regex`(?<prefix>sens|respons)e\ and\ \k<prefix>ibility`
/* Matches:
- 'sense and sensibility'
- 'response and responsibility' */

// A subroutine with \g<name>
regex`(?<prefix>sens|respons)e\ and\ \g<prefix>ibility`
/* Matches:
- 'sense and sensibility'
- 'sense and responsibility'
- 'response and sensibility'
- 'response and responsibility' */

Subroutines go beyond the composition benefits of interpolation. Apart from the obvious difference that they don't require variables to be defined outside of the regex, they also don't simply insert the referenced subpattern.

1. They can reference groups that themselves contain subroutines, chained to any depth.
2. Any capturing groups that are set during the subroutine call revert to their previous values afterwards.
3. They don't create named captures that are visible outside of the subroutine, so using subroutines doesn't lead to "duplicate capture group name" errors.

To illustrate points 2 and 3, consider:

regex`
  (?<double> (?<char>.)\k<char>)
  \g<double>
  \k<double>
`

The backreference \k<double> matches whatever was matched by capturing group (?<double>…), regardless of what was matched in between by the subroutine \g<double>. For example, this regex matches 'xx!!xx', but not 'xx!!!!'.

const ipv4 = regex`
  \b \g<byte> (\. \g<byte>){3} \b

  # Define the 'byte' subpattern
  (?<byte> 25[0-5] | 2[0-4]\d | 1\d\d | [1-9]?\d){0}
`;

const record = regex`
  ^ Admitted:\ (?<admitted> \g<date>) \n
    Released:\ (?<released> \g<date>) $

  # Define subpatterns
  ( (?<date>  \g<year>-\g<month>-\g<day>)
    (?<year>  \d{4})
    (?<month> \d{2})
    (?<day>   \d{2})
  ){0}
`;

[!NOTE] Subroutines are based on the feature in PCRE and Perl. PCRE allows several syntax options including \g<name>, whereas Perl uses (?&name). Ruby also supports subroutines (and uses the \g<name> syntax), but it has behavior differences that make its subroutines not always act as independent subpatterns.

Subroutine definition groups

The syntax (?(DEFINE)…) can be used at the end of a regex to define subpatterns for use by reference only. When combined with subroutines, this enables writing regexes in a grammatical way that can significantly improve readability and maintainability.

Named groups defined within subroutine definition groups don't appear on the groups object of matches.

Example:

const re = regex`
  ^ Admitted:\ (?<admitted> \g<date>) \n
    Released:\ (?<released> \g<date>) $

  (?(DEFINE)
    (?<date>  \g<year>-\g<month>-\g<day>)
    (?<year>  \d{4})
    (?<month> \d{2})
    (?<day>   \d{2})
  )
`;

const record = 'Admitted: 2024-01-01\nReleased: 2024-01-03';
const match = re.exec(record); // Same as `record.match(re)`
console.log(match.groups);
/* → {
  admitted: '2024-01-01',
  released: '2024-01-03'
} */

[!NOTE] Subroutine definition groups are based on the feature in PCRE and Perl. However, regex supports a stricter version since it limits their placement, quantity, and the top-level syntax that can be used within them.

Recursion

The regex plugin regex-recursion enables the syntax (?R) and \g<name> to match recursive/balanced patterns up to a specified max depth.

🚩 Flags

Flags are added like this:

regex('gm')`^.+`

RegExp instances interpolated into the pattern preserve their own flags locally (see Interpolating regexes).

Implicit flags

Flag <kbd>v</kbd> and emulated flags <kbd>x</kbd> and <kbd>n</kbd> are always on when using regex, giving your regexes a modern baseline syntax and avoiding the need to continually opt-in to their superior modes.

For special situations such as when using regex within other tools, implicit flags can be disabled. See: Options.

Flag v

JavaScript's native flag <kbd>v</kbd> gives you the best level of Unicode support, strict errors, and all the latest regex features like character class set operations and properties of strings (see MDN). It's always on when using regex, which helps avoid numerous Unicode-related bugs, and means there's only one way to parse a regex instead of four (so you only need to remember one set of regex syntax and behavior).

Flag <kbd>v</kbd> is applied to the full pattern after interpolation happens.

In environments without native support for flag <kbd>v</kbd>, flag <kbd>u</kbd> is automatically used instead while applying <kbd>v</kbd>'s escaping rules so your regexes are forward and backward compatible.

Flag x

Emulated flag <kbd>x</kbd> makes whitespace insignificant and adds support for line comments (starting with #), allowing you to freely format your regexes for readability. It's always implicitly on, though it doesn't extend into interpolated RegExp instances (to avoid changing their meaning).

Example:

const re = regex`
  # Match a date in YYYY-MM-DD format
  (?<year>  \d{4}) - # Year part
  (?<month> \d{2}) - # Month part
  (?<day>   \d{2})   # Day part

  # Escape whitespace and hashes to match them literally
  \    # space char
  \x20 # space char
  \#   # hash char
  \s   # any whitespace char

  # Since embedded strings are always matched literally, you can also match
  # whitespace by embedding it as a string
  ${' '}+

  # Patterns are directly embedded, so they use free spacing
  ${pattern`\d + | [a - z]`}

  # Interpolated regexes use their own flags, so they preserve their whitespace
  ${/^Fat cat$/m}
`;

[!NOTE] Flag <kbd>x</kbd> is based on the JavaScript proposal for it as well as support in many other regex flavors. Note that the rules for whitespace within character classes are inconsistent across regex flavors, so regex follows the JavaScript proposal and the flag <kbd>xx</kbd> option from Perl and PCRE.

Flag n

Emulated flag <kbd>n</kbd> gives you named capture only mode, which turns unnamed groups (…) into noncapturing groups. It's always implicitly on, though it doesn't extend into interpolated RegExp instances (to avoid changing their meaning).

Requiring the syntactically clumsy (?:…) where you could just use (…) hurts readability and encourages adding unneeded captures (which hurt efficiency and refactoring). Flag <kbd>n</kbd> fixes this, making your regexes more readable.

Example:

// Doesn't capture
regex`\b(ab|cd)\b`
// Use standard (?<name>…) to capture as `name`

[!NOTE] Flag <kbd>n</kbd> is based on .NET, C++, PCRE, Perl, and XRegExp, which share the <kbd>n</kbd> flag letter but call it explicit capture, no auto capture, or nosubs. In regex, flag <kbd>n</kbd> also prevents using numbered backreferences to refer to named groups in the outer regex, which follows the behavior of C++ (Ruby also always prevents this, despite not having flag <kbd>n</kbd>). Referring to named groups by number is a footgun, and the way that named groups are numbered is inconsistent across regex flavors.

🧩 Interpolation

Interpolating regexes

The meaning of flags (or their absense) on interpolated regexes is preserved. For example, with flag <kbd>i</kbd> (ignoreCase):

regex`hello-${/world/i}`
// Matches 'hello-WORLD' but not 'HELLO-WORLD'

regex('i')`hello-${/world/}`
// Matches 'HELLO-world' but not 'HELLO-WORLD'

This is also true for other flags that can change how an inner regex is matched: m (multiline) and s (dotAll).

As with all interpolation in regex, embedded regexes are sandboxed and treated as complete units. For example, a following quantifier repeats the entire embedded regex rather than just its last token, and top-level alternation in the embedded regex will not break out to affect the meaning of the outer regex. Numbered backreferences within embedded regexes are adjusted to work within the overall pattern.

Interpolating escaped strings

regex escapes special characters in interpolated strings (and values coerced to strings). This escaping is done in a context-aware and safe way that prevents changing the meaning or error status of characters outside the interpolated string.

As with all interpolation in regex, escaped strings are sandboxed and treated as complete units. For example, a following quantifier repeats the entire escaped string rather than just its last character. And if interpolating into a character class, the escaped string is treated as a flag-<kbd>v</kbd>-mode nested union if it contains more than one character node.

As a result, regex is a safe and context-aware alternative to JavaScript proposal RegExp.escape.

// Instead of
RegExp.escape(str)
// You can say
regex`${str}`.source

// Instead of
new RegExp(`^(?:${RegExp.escape(str)})+$`)
// You can say
regex`^${str}+$`

// Instead of
new RegExp(`[a-${RegExp.escape(str)}]`, 'u') // Flag u/v required to avoid bugs
// You can say
regex`[a-${str}]`
// Given the context at the end of a range, throws if more than one char in str

// Instead of
new RegExp(`[\\w--[${RegExp.escape(str)}]]`, 'v') // Set subtraction
// You can say
regex`[\w--${str}]`

Some examples of where context awareness comes into play:

• A ~ is not escaped at the top level, but it must be escaped within character classes if it's immediately preceded or followed by another ~ (in or outside of the interpolation) which would turn it into a reserved UnicodeSets double punctuator.
• Leading digits must be escaped if they're preceded by a numbered backreference or \0, else RegExp throws (or in Unicode-unaware mode they might turn into octal escapes).
• Letters A-Z and a-z must be escaped if preceded by uncompleted token \c, else they'll convert what should be an error into a valid token that probably doesn't match what you expect.
• You can't escape your way out of protecting against a preceding unescaped \. Doing nothing could turn e.g. w into \w and introduce a bug, but then escaping the first character wouldn't prevent the \ from mangling it, and if you escaped the preceding \ elsewhere in your code you'd change its meaning.

These and other issues (including the effects of current and potential future flags like <kbd>x</kbd>) make escaping without context unsafe to use at arbitrary positions in a regex, or at least complicated to get right. The existing popular regex escaping libraries don't even attempt to handle these kinds of issues.

regex solves all of this via context awareness. So instead of remembering anything above, you should just switch to always safely escaping regex syntax via regex.

Interpolating partial patterns

As an alternative to interpolating RegExp instances, you might sometimes want to interpolate partial regex patterns as strings. Some example use cases:

• Composing a dynamic number of strings.
• Adding a pattern inside a character class (not allowed for RegExp instances since their top-level syntax context doesn't match).
• Dynamically adding backreferences without their corresponding captures (which wouldn't be valid as a standalone RegExp).
• When you don't want the pattern to specify its own, local flags.

For all of these cases, you can interpolate pattern(str) to avoid escaping special characters in the string or creating an intermediary RegExp instance. You can also use pattern`…` as a tag, as shorthand for pattern(String.raw`…`).

Apart from edge cases, pattern just embeds the provided string or other value directly. But because it handles the edge cases, patterns can safely be interpolated anywhere in a regex without worrying about their meaning being changed by (or making unintended changes in meaning to) the surrounding pattern.

As with all interpolation in regex, patterns are sandboxed and treated as complete units. This is relevant e.g. if a pattern is followed by a quantifier, if it contains top-level alternation, or if it's bordered by a character class range, subtraction, or intersection operator.

If you want to understand the handling of interpolated patterns more deeply, let's look at some edge cases…

regex`[${pattern`^`}a]`
regex`[a${pattern`^`}]`

regex`(${pattern(')')})`
regex`[${pattern(']')}]`
regex`[${pattern('a\\')}]]`

regex`(${pattern('()')})`
regex`[\w--${pattern('[_]')}]`
regex`[${pattern('\\\\')}]`

// Not using `pattern` for values that are not escaped anyway, but the behavior
// would be the same if you did
regex`.{1,${6}}`
regex`\p{${'Letter'}}`
regex`\u{${'000A'}}`
regex`(?<${'name'}>…)\k<${'name'}>`
regex`[a-${'z'}]`
regex`[\w--${'_'}]`

// Not using `pattern` for values that are not escaped anyway
/* 1.*/ regex`\u${'000A'}`
/* 2.*/ regex`\u{${pattern`A}`}`
/* 3.*/ regex`(${pattern`?:`}…)`

// This works fine
regex`[\0-${pattern`\cZ`}]`

// But this is an error since you can't create a range from 'a' to the set 'de'
regex`[a-${'de'}]`
// It's the same as if you tried to use /[a-[de]]/v

// Instead, use either of
regex`[a-${'d'}${'e'}]`
regex`[a-${'d'}e]`
// These are equivalent to /[a-de]/ or /[[a-d][e]]/v

Implementation note: pattern returns an object with a custom toString that simply returns String(value).

Patterns are not intended as an intermediate regex type. You can think of pattern as a directive to the regex tag: treat this string as a partial pattern rather than a string to be matched literally.

Interpolation principles

The above descriptions of interpolation might feel complex. But there are three simple rules that guide the behavior in all cases:

1. Interpolation never changes the meaning or error status of characters outside of the interpolation, and vice versa.
2. Interpolated values are always aware of the context of where they're embedded.
3. When relevant, interpolated values are always treated as complete units.

Examples where rule #3 is relevant: With following quantifiers, if they contain top-level alternation or numbered backreferences, or if they're placed in a character class range or set operation.

Interpolation contexts

• Atomized means that the value is treated as a complete unit; it isn't related to the atomic groups feature. Example: In default context, ${x}* matches any number of the value specified by x, and not just its last token. In character class context, subtraction and intersection operators apply to the entire atom.
• Sandboxed means that the value can't change the meaning or error status of characters outside of the interpolation, and vice versa.
• Character classes have a sub-context on the borders of ranges. Only one character node (e.g. a or \u0061) can be interpolated at these positions.

The implementation details vary for how regex accomplishes sandboxing and atomization, based on the details of the specific pattern. But the concepts should always hold up.

🔩 Options

Typically, regex is used as follows:

regex`…` // Without flags
regex('gi')`…` // With flags

However, several options are available that can be provided via an options object in place of the flags argument. These options aren't usually needed, and are primarily intended for use within other tools.

Following are the available options and their default values:

regex({
  flags: '',
  subclass: false,
  plugins: [],
  unicodeSetsPlugin: <function>,
  disable: {
    x: false,
    n: false,
    v: false,
    atomic: false,
    subroutines: false,
  },
  force: {
    v: false,
  },
})`…`;

Returning a string

Function rewrite returns an object with properties expression and flags as strings, rather than returning a RegExp instance. This can be useful for tools that want to process the output.

import {rewrite} from 'regex';
rewrite('^ (ab | cd)', {flags: 'm'});
// → {expression: '^(?:ab|cd)', flags: 'mv'}

rewrite shares all of regex's options (described above) except subclass. Providing the resulting expression and flags to the RegExp constructor produces the same result as using the regex tag.

Since rewrite isn't a template tag, it doesn't provide context-aware interpolation and doesn't automatically handle input as a raw string (you need to escape your backslashes).

⚡ Performance

regex transpiles its input to native RegExp instances. Therefore regexes created by regex perform equally as fast as native regexes. The use of regex can also be transpiled via a Babel plugin, avoiding the tiny overhead of transpiling at runtime.

For regexes that rely on or have the potential to trigger heavy backtracking, you can dramatically improve beyond native performance via regex's atomic groups and possessive quantifiers.

🪶 Compatibility

regex uses flag <kbd>v</kbd> (unicodeSets) when it's supported natively. Flag <kbd>v</kbd> is supported by Node.js 20 and 2023-era browsers (compat table). When <kbd>v</kbd> isn't available, flag <kbd>u</kbd> is automatically used instead while enforcing <kbd>v</kbd>'s escaping rules, which extends support to Node.js 14 and 2020-era browsers.

The following edge cases rely on modern JavaScript features:

• To ensure atomization, regex uses nested character classes (which require flag <kbd>v</kbd>) when interpolating more than one token at a time inside character classes. A descriptive error is thrown when this isn't supported, which you can avoid by not interpolating multi-token patterns or strings into character classes. There's also an easy workaround: put the whole character class in a pattern and interpolate a string into the pattern.
• Using an interpolated RegExp instance with a different value for flag <kbd>i</kbd> than its outer regex relies on pattern modifiers, a bleeding-edge feature available in Chrome/Edge 125 and Opera 111. A descriptive error is thrown in environments without support, which you can avoid by aligning the use of flag <kbd>i</kbd> on inner and outer regexes. Local-only application of other flags doesn't rely on this feature.

🙋 FAQ

import {regex, pattern} from 'regex';
const str = '…';
const re = regex('g')`${pattern(str)}`;

import {regex} from 'regex';
const str = '…';
const re = regex('g')({raw: [str]});

🏷️ About

regex was created by Steven Levithan and contributors. Inspiration included PCRE, XRegExp, and regexp-make-js.

If you want to support this project, I'd love your help by contributing improvements, sharing it with others, or sponsoring future development.

© 2024–present. MIT License.

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