id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_RegExp/javascriptregexpexer_14_0.txt | **Live Demo:** | |
Mmdn_RegExp/Regularexpressions_213_0.txt | ## Support | |
Mmdn_RegExp/toString_45_0.txt | A customized MDN experience | |
Mmdn_RegExp/Mmdn_RegExp_20_4.txt |
Deprecated
]: Deprecated. Not for use in new websites.
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
Non-standard
... | |
Mmdn_RegExp/Regularexpressions_166_0.txt | [ ` RegExp.prototype.exec() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec) method with the `
g ` flag returns each match and its position iteratively. | |
Mmdn_RegExp/Regularexpressions_129_0.txt | ## Using regular expressions in JavaScript | |
Mmdn_RegExp/Mmdn_RegExp_15_3.txt | milarly, a regex is _Unicode-unaware_ if it has neither the ` u ` nor the `
v ` flag. In this case, the regex is interpreted as a sequence of UTF-16 code
units, and there are many legacy syntaxes that do not become syntax errors.
## Examples
### Using the unicode property
js
const regex = /\u{61}/u;... | |
Mmdn_RegExp/Mmdn_RegExp_21_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Mmdn_RegExp_5_5.txt | k cross-browser support before using.
| |
Mmdn_RegExp/exec_71_0.txt | 4. [ ` Function.prototype.call() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call)
5. [ ` Function.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/toString)
10. Static properties
1. [ ` Function.prototype.arguments ` ](/en-US/docs/Web/JavaScript/Reference/Globa... | |
Mmdn_RegExp/javascriptregexpexer_27_0.txt | * * * | |
Mmdn_RegExp/exec_83_0.txt | If the match fails, the ` exec() ` method returns [ ` null ` ](/en-
US/docs/Web/JavaScript/Reference/Operators/null) , and sets the regex's [ `
lastIndex ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex) to ` 0 ` . | |
Mmdn_RegExp/Regularexpressions_135_0.txt |
If you do not need to access the properties of the regular expression, an
alternative way of creating ` myArray ` is with this script: | |
Mmdn_RegExp/Mmdn_RegExp_11_1.txt | ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
11.... | |
Mmdn_RegExp/Regularexpressions_17_0.txt | * [ Web APIs | |
Mmdn_RegExp/exec_65_0.txt | * English (US) | |
Mmdn_RegExp/Mmdn_RegExp_29_3.txt | string)
## Browser compatibility
BCD tables only load in the browser with JavaScript enabled. Enable
JavaScript to view data.
## See also
* [ ` Object.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString)
## Help improve MDN
Was this page helpful to you?
Yes No
... | |
Mmdn_RegExp/Regularexpressions_41_0.txt | * [ Accessibility | |
Mmdn_RegExp/Mmdn_RegExp_23_3.txt | console.log(regex.ignoreCase); // true
## Specifications
Specification
---
[ ECMAScript Language Specification
# sec-get-regexp.prototype.ignorecase
](https://tc39.es/ecma262/multipage/text-processing.html#sec-get-
regexp.prototype.ignorecase)
## Browser compatibility
BCD tables only load in the b... | |
Mmdn_RegExp/Mmdn_RegExp_8_1.txt | tIndex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
... | |
Mmdn_RegExp/Regularexpressions_55_0.txt | ](/en-US/plus/docs/features/overview) | |
Mmdn_RegExp/Regularexpressions_98_0.txt | When the search for a match requires something more than a direct match, such
as finding one or more b's, or finding white space, you can include special
characters in the pattern. For example, to match _a single` "a" ` followed by
zero or more ` "b" ` s followed by ` "c" ` _ , you'd use the pattern ` /ab*c/
` : the ` ... | |
Mmdn_RegExp/toString_19_0.txt | ](/en-US/docs/Web/API) | |
Mmdn_RegExp/exec_95_0.txt | JavaScript [ ` RegExp ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) objects are _stateful_
when they have the [ global ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/global) or [ sticky
](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky) flags set
(e.g. ` /foo/g ` or `... | |
Mmdn_RegExp/Regularexpressions_170_0.txt | console.log(str.match(re)); // ["fee ", "fi ", "fo "] | |
Mmdn_RegExp/exec_133_0.txt | * [ MDN on Mastodon ](https://mozilla.social/@mdn)
* [ MDN on X (formerly Twitter) ](https://twitter.com/mozdevnet)
* [ MDN on GitHub ](https://github.com/mdn/)
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Mmdn_RegExp/Regularexpressions_117_0.txt | **Note:** [ A larger cheat sheet is also available ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Cheatsheet) (only aggregating
parts of those individual articles). | |
Mmdn_RegExp/Mmdn_RegExp_18_8.txt | Portions of this content are ©1998â 2024 by individual mozilla.org
contributors. Content available under [ a Creative Commons license ](/en-
US/docs/MDN/Writing_guidelines/Attrib_copyright_license) .
*[
Deprecated
]: Deprecated. Not for use in n... | |
Mmdn_RegExp/Regularexpressions_214_0.txt | * [ Product help ](https://support.mozilla.org/products/mdn-plus)
* [ Report an issue ](/en-US/docs/MDN/Community/Issues) | |
Mmdn_RegExp/Regularexpressions_156_0.txt | For example, ` re = /\w+\s/g ` creates a regular expression that looks for one
or more characters followed by a space, and it looks for this combination
throughout the string. | |
Mmdn_RegExp/exec_61_0.txt | Theme | |
Mmdn_RegExp/Regularexpressions_67_0.txt | Filter sidebar Clear filter input | |
Mmdn_RegExp/toString_81_0.txt | ### Return value | |
Mmdn_RegExp/Mmdn_RegExp_17_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Regularexpressions_59_0.txt | * [ Curriculum New ](/en-US/curriculum/)
* [ Blog ](/en-US/blog/)
* [ Play ](/en-US/play)
* [ AI Help Beta ](/en-US/plus/ai-help) | |
Mmdn_RegExp/Regularexpressions_165_0.txt | #### Using the global search flag with exec() | |
Mmdn_RegExp/exec_18_0.txt | Interfaces for building web applications | |
Mmdn_RegExp/Mmdn_RegExp_4_3.txt | cts/RegExp/ignoreCase)
* [ ` RegExp.prototype.multiline ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/multiline)
* [ ` RegExp.prototype.source ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source)
* [ ` RegExp.prototype.sticky ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objec... | |
Mmdn_RegExp/Mmdn_RegExp_21_2.txt | Script/Reference/Global_Objects/Object/constructor)
2. [ ` Object.prototype.__proto__ ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto) Deprecated
13. Methods
1. [ ` Object.prototype.__defineGetter__() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__) Depre... | |
Mmdn_RegExp/Mmdn_RegExp_5_3.txt | once. For each ` exec() ` result, the substitution will
be prepared based on the description in [ ` String.prototype.replace() `
](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#description) .
Because ` @@replace ` would keep calling ` exec() ` until it returns ` null `
, and ` exec() ` would aut... | |
Mmdn_RegExp/exec_12_0.txt | General-purpose scripting language | |
Mmdn_RegExp/javascriptregexpexer_26_0.txt | Load Disqus Comments | |
Mmdn_RegExp/Regularexpressions_182_0.txt | #### HTML | |
Mmdn_RegExp/Mmdn_RegExp_0_11.txt | JavaScript/Reference/Global_Objects/GeneratorFunction)
* [ ` AsyncGeneratorFunction ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/AsyncGeneratorFunction)
* [ ` Generator ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator)
* [ ` AsyncGenerator ` ](/en-US/docs/Web/JavaScript/Reference/Globa... | |
Mmdn_RegExp/Mmdn_RegExp_18_2.txt | rototype.__proto__ ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto) Deprecated
13. Methods
1. [ ` Object.prototype.__defineGetter__() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__) Deprecated
2. [ ` Object.prototype.__defineSetter__() ` ](/en-US/docs/W... | |
Mmdn_RegExp/Regularexpressions_101_0.txt | Assertions include boundaries, which indicate the beginnings and endings of
lines and words, and other patterns indicating in some way that a match is
possible (including look-ahead, look-behind, and conditional expressions). | |
Mmdn_RegExp/Mmdn_RegExp_26_4.txt | %2FJavaScript%2FReference%2FGlobal_Objects%2FRegExp%2F%40%40split&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-
us%2Fweb%2Fjavascript%2Freference%2Fglobal_objects%2Fregexp%2F%40%40split%60%0A*+MDN+URL%3A+https%3A%2F... | |
Mmdn_RegExp/Mmdn_RegExp_13_3.txt | en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/compile/contributors.txt)
.
[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/javascript/reference/global_objects/regexp/compile/index.md?plain=1
"Folder: en-us/web/javascript/reference/global_objects/regexp/compile \(Opens... | |
Mmdn_RegExp/exec_24_0.txt | Web technology reference for developers | |
Mmdn_RegExp/Regularexpressions_35_0.txt | * [ CSS | |
Mmdn_RegExp/Regularexpressions_225_0.txt | ]: Non-standard. Check cross-browser support before using. | |
Mmdn_RegExp/Regularexpressions_36_0.txt | Learn to style content using CSS | |
Mmdn_RegExp/Mmdn_RegExp_0_12.txt | iscourse.mozilla.org/c/mdn/236)
* [ MDN Chat ](/discord)
## Developers
* [ Web Technologies ](/en-US/docs/Web)
* [ Learn Web Development ](/en-US/docs/Learn)
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[ Mozilla logo ](https://www.mozilla.org/)
* [ Website Privacy Notice ]... | |
Mmdn_RegExp/toString_27_0.txt | Learn web development | |
Mmdn_RegExp/Mmdn_RegExp_28_2.txt | al_Objects/Object/constructor)
2. [ ` Object.prototype.__proto__ ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto) Deprecated
13. Methods
1. [ ` Object.prototype.__defineGetter__() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__) Deprecated
2. [ ` Obj... | |
Mmdn_RegExp/exec_32_0.txt | * [ HTML | |
Mmdn_RegExp/toString_97_0.txt | ## Browser compatibility | |
Mmdn_RegExp/Mmdn_RegExp_15_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Mmdn_RegExp_17_1.txt | p: lastIndex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprec... | |
Mmdn_RegExp/Mmdn_RegExp_15_2.txt | _Objects/Object/constructor)
2. [ ` Object.prototype.__proto__ ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto) Deprecated
13. Methods
1. [ ` Object.prototype.__defineGetter__() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/__defineGetter__) Deprecated
2. [ ` Objec... | |
Mmdn_RegExp/toString_12_0.txt | General-purpose scripting language | |
Mmdn_RegExp/Regularexpressions_102_0.txt | [ Character classes ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes) guide | |
Mmdn_RegExp/javascriptregexpexer_20_0.txt | Test your Programming skills with w3resource's [ quiz.
](https://www.w3resource.com/quizzes/index.php) | |
Mmdn_RegExp/Mmdn_RegExp_14_1.txt | d
8. [ ` RegExp: lastIndex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegEx... | |
Mmdn_RegExp/Mmdn_RegExp_10_1.txt | dex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
... | |
Mmdn_RegExp/Regularexpressions_202_0.txt | ## Help improve MDN | |
Mmdn_RegExp/Regularexpressions_209_0.txt | Your blueprint for a better internet. | |
Mmdn_RegExp/Regularexpressions_103_0.txt | Distinguish different types of characters. For example, distinguishing between
letters and digits. | |
Mmdn_RegExp/javascriptregexpexer_1_0.txt | # JavaScript: Check whether the first character of a string is uppercase or
not | |
Mmdn_RegExp/exec_53_0.txt | * [ Documentation | |
Mmdn_RegExp/exec_36_0.txt | Learn to style content using CSS | |
Mmdn_RegExp/Regularexpressions_3_0.txt | Web technology reference for developers | |
Mmdn_RegExp/toString_112_0.txt | ## Support | |
Mmdn_RegExp/exec_58_0.txt | ](/en-US/plus/docs/faq) | |
Mmdn_RegExp/Regularexpressions_196_0.txt | An online regex builder/debugger | |
Mmdn_RegExp/toString_116_0.txt | ## Developers | |
Mmdn_RegExp/toString_72_0.txt | ## In this article | |
Mmdn_RegExp/exec_128_0.txt | [ Learn how to contribute
](https://github.com/mdn/content/blob/main/CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") . | |
Mmdn_RegExp/Mmdn_RegExp_26_1.txt | 8. [ ` RegExp: lastIndex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/la... | |
Mmdn_RegExp/exec_82_0.txt | ### Return value | |
Mmdn_RegExp/exec_88_0.txt | The original string that was matched against. | |
Mmdn_RegExp/Regularexpressions_106_0.txt | [ Quantifiers ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers) guide | |
Mmdn_RegExp/Mmdn_RegExp_18_1.txt | /Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
11. [ ` RegExp.leftContext ($`) ` ](/en-US/... | |
Mmdn_RegExp/javascriptregexpexer_4_0.txt | Write a JavaScript program to test whether the first character of a string is
uppercase or not. | |
Mmdn_RegExp/Regularexpressions_42_0.txt | Learn to make the web accessible to all | |
Mmdn_RegExp/exec_94_0.txt | ## Description | |
Mmdn_RegExp/exec_10_0.txt | ](/en-US/docs/Web/CSS) | |
Mmdn_RegExp/Regularexpressions_112_0.txt | [ Assertions ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions) | |
Mmdn_RegExp/exec_135_0.txt | * [ About ](/en-US/about)
* [ Blog ](/en-US/blog/)
* [ Careers ](https://www.mozilla.org/en-US/careers/listings/?team=ProdOps)
* [ Advertise with us ](/en-US/advertising) | |
Mmdn_RegExp/Regularexpressions_66_0.txt | * [ Español ](/es/docs/Web/JavaScript/Guide/Regular_expressions)
* [ Français ](/fr/docs/Web/JavaScript/Guide/Regular_expressions)
* [ æ¥æ¬èª ](/ja/docs/Web/JavaScript/Guide/Regular_expressions)
* [ íêµì´ ](/ko/docs/Web/JavaScript/Guide/Regular_expressions)
* [ Português (do Brasil) ](/pt-BR/docs/Web/Ja... | |
Mmdn_RegExp/exec_55_0.txt | ](/en-US/plus/docs/features/overview) | |
Mmdn_RegExp/Regularexpressions_180_0.txt | The regular expression looks for: | |
Mmdn_RegExp/toString_8_0.txt | * [ CSS | |
Mmdn_RegExp/toString_118_0.txt | [ Mozilla logo ](https://www.mozilla.org/) | |
Mmdn_RegExp/Mmdn_RegExp_21_3.txt | would not be reset. In this case, each call to ` match() ` may
return a different result.
js
const re = /[abc]/y;
for (let i = 0; i < 5; i++) {
console.log("abc".match(re), re.lastIndex);
}
// [ 'a' ] 1
// [ 'b' ] 2
// [ 'c' ] 3
// null 0
// [ 'a' ] 1
When the reg... | |
Mmdn_RegExp/Regularexpressions_96_0.txt | Simple patterns are constructed of characters for which you want to find a
direct match. For example, the pattern ` /abc/ ` matches character
combinations in strings only when the exact sequence ` "abc" ` occurs (all
characters together and in that order). Such a match would succeed in the
strings ` "Hi, do you know yo... | |
Mmdn_RegExp/Mmdn_RegExp_18_4.txt | tch() ` would construct a new ` RegExp ` object with the two
enclosing slashes added by [ ` re.toString() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/toString) ), but it can
be used for virtually everything else.
js
const re = /bar/g;
re[Symbol.match] = false;
"/bar/g".endsWi... | |
Mmdn_RegExp/Regularexpressions_52_0.txt | ](/en-US/plus/updates) | |
Mmdn_RegExp/exec_79_0.txt |
### Parameters | |
Mmdn_RegExp/Regularexpressions_31_0.txt | ](/en-US/docs/Learn) |
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