id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
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|---|---|---|
Mmdn_RegExp/exec_134_0.txt | ## MDN | |
Mmdn_RegExp/Mmdn_RegExp_25_4.txt | in new websites.
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
Non-standard
]: Non-standard. Check cross-browser support before using.
| |
Mmdn_RegExp/toString_13_0.txt | ](/en-US/docs/Web/JavaScript) | |
Mmdn_RegExp/Regularexpressions_104_0.txt | [ Groups and backreferences ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences)
guide | |
Mmdn_RegExp/Mmdn_RegExp_0_2.txt | e/Global_Objects/Function)
28. [ Generator ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator)
29. [ GeneratorFunction ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/GeneratorFunction)
30. [ globalThis ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis)
31. [ Infinity ]... | |
Mmdn_RegExp/Mmdn_RegExp_25_0.txt | * Skip to main content
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Mmdn_RegExp/toString_69_0.txt | * Try it
* Syntax
* Description
* Examples
* Specifications
* Browser compatibility
* See also | |
Mmdn_RegExp/exec_1_0.txt | [ MDN Web Docs ](/en-US/) Open main menu | |
Mmdn_RegExp/exec_46_0.txt | ](/en-US/plus) | |
Mmdn_RegExp/toString_124_0.txt | ]: Non-standard. Check cross-browser support before using. | |
Mmdn_RegExp/toString_86_0.txt | ## Examples | |
Mmdn_RegExp/toString_92_0.txt | Since ` toString() ` accesses the [ ` source ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source) property, an
empty regular expression returns the string ` "/(?:)/" ` , and line
terminators such as ` \n ` are escaped. This makes the returned value always a
valid regex literal. | |
Mmdn_RegExp/Regularexpressions_169_0.txt |
In contrast, [ ` String.prototype.match() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String/match) method returns
all matches at once, but without their position. | |
Mmdn_RegExp/toString_54_0.txt | Learn how to use MDN Plus | |
Mmdn_RegExp/toString_96_0.txt | Specification
---
[ ECMAScript Language Specification
# sec-regexp.prototype.tostring ](https://tc39.es/ecma262/multipage/text-
processing.html#sec-regexp.prototype.tostring) | |
Mmdn_RegExp/exec_25_0.txt | ](/en-US/docs/Web) | |
Mmdn_RegExp/toString_98_0.txt | BCD tables only load in the browser with JavaScript enabled. Enable
JavaScript to view data. | |
Mmdn_RegExp/Regularexpressions_76_0.txt | 6. [ Character escape: \n, \u{...} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Character_escape)
7. [ Disjunction: | ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Disjunction)
8. [ Input boundary assertion: ^, $ ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Input_boundary_assert... | |
Mmdn_RegExp/Regularexpressions_64_0.txt | Article Actions | |
Mmdn_RegExp/javascriptregexpexer_13_0.txt |  | |
Mmdn_RegExp/toString_44_0.txt | * Plus [ Plus ](/en-US/plus)
* [ Overview | |
Mmdn_RegExp/Mmdn_RegExp_0_9.txt | JavaScript's standard, built-in objects,
including their methods and properties.
The term "global objects" (or standard built-in objects) here is not to be
confused with **the global object** . Here, "global objects" refer to
**objects in the global scope** .
The **global object** itself can be accessed using the [ ... | |
Mmdn_RegExp/Regularexpressions_219_0.txt | [ Mozilla logo ](https://www.mozilla.org/) | |
Mmdn_RegExp/Regularexpressions_142_0.txt | As shown in the second form of this example, you can use a regular expression
created with an object initializer without assigning it to a variable. If you
do, however, every occurrence is a new regular expression. For this reason, if
you use this form without assigning it to a variable, you cannot subsequently
access ... | |
Mmdn_RegExp/Mmdn_RegExp_12_1.txt | gExp: 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) D... | |
Mmdn_RegExp/Regularexpressions_189_0.txt | output.textContent = ok
? `Thanks, your phone number is ${ok[0]}`
: `${phoneInput.value} isn't a phone number with area code!`;
} | |
Mmdn_RegExp/Mmdn_RegExp_8_0.txt | * Skip to main content
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* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/toString_91_0.txt |
### Empty regular expressions and escaping | |
Mmdn_RegExp/Mmdn_RegExp_20_1.txt | stIndex ` ](/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/javascriptregexpexer_28_0.txt | [ This work is licensed under a Creative Commons Attribution 4.0 International
License. ](http://creativecommons.org/licenses/by-nc/4.0/) | |
Mmdn_RegExp/toString_122_0.txt | ]: Deprecated. Not for use in new websites.
*[ | |
Mmdn_RegExp/Regularexpressions_21_0.txt | Developing extensions for web browsers | |
Mmdn_RegExp/Regularexpressions_187_0.txt | const re = /^(?:\d{3}|\(\d{3}\))([-/.])\d{3}\1\d{4}$/; | |
Mmdn_RegExp/Regularexpressions_34_0.txt | ](/en-US/docs/Learn/HTML) | |
Mmdn_RegExp/Mmdn_RegExp_6_4.txt | it
parent, the [ Mozilla Foundation ](https://foundation.mozilla.org/) .
Portions of this content are ©1998â 2024 by individual mozilla.org
contributors. Content available under [ a Creative Commons license ](/en-
US/docs/MDN/Writing_guidelines/Attrib_copyright_license) .
*[
... | |
Mmdn_RegExp/Regularexpressions_92_0.txt | ## Writing a regular expression pattern | |
Mmdn_RegExp/exec_136_0.txt | ## Support | |
Mmdn_RegExp/Regularexpressions_68_0.txt | ## In this article | |
Mmdn_RegExp/Regularexpressions_224_0.txt | Non-standard | |
Mmdn_RegExp/Regularexpressions_136_0.txt | const myArray = /d(b+)d/g.exec("cdbbdbsbz");
// similar to 'cdbbdbsbz'.match(/d(b+)d/g); however,
// 'cdbbdbsbz'.match(/d(b+)d/g) outputs [ "dbbd" ]
// while /d(b+)d/g.exec('cdbbdbsbz') outputs [ 'dbbd', 'bb', index: 1, input: 'cdbbdbsbz' ] | |
Mmdn_RegExp/exec_113_0.txt | * Do _not_ place the regular expression literal (or [ ` RegExp ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) constructor) within the ` while ` condition â it will recreate the regex for every iteration and reset [ ` lastIndex ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex) ... | |
Mmdn_RegExp/exec_9_0.txt | Code used to describe document style | |
Mmdn_RegExp/Mmdn_RegExp_7_0.txt | * Skip to main content
* Skip to search
* Skip to select language
[ MDN Web Docs ](/en-US/) Open main menu
* References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology Web technology reference for developers ](/en-US/docs/Web)
* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Mmdn_RegExp_2_1.txt | /en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
11. [ `... | |
Mmdn_RegExp/exec_45_0.txt | A customized MDN experience | |
Mmdn_RegExp/Regularexpressions_155_0.txt |
Note that the flags are an integral part of a regular expression. They cannot
be added or removed later. | |
Mmdn_RegExp/exec_110_0.txt |
This script displays the following text: | |
Mmdn_RegExp/exec_98_0.txt | * If you only care whether the regex matches a string, but not what is actually being matched, use [ ` RegExp.prototype.test() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test) instead.
* If you are finding all occurrences of a global regex and you don't care about information like capturing groups, ... | |
Mmdn_RegExp/Mmdn_RegExp_23_4.txt | /privacy/websites/#cookies)
* [ Legal ](https://www.mozilla.org/about/legal/terms/mozilla)
* [ Community Participation Guidelines ](https://www.mozilla.org/about/governance/policies/participation/)
Visit [ Mozilla Corporationâs ](https://www.mozilla.org) not-for-profit
parent, the [ Mozilla Foundation ](https:... | |
Mmdn_RegExp/Regularexpressions_100_0.txt | [ Assertions ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions) guide | |
Mmdn_RegExp/Mmdn_RegExp_19_1.txt | Script/Reference/Global_Objects/RegExp/lastIndex)
9. [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch) Deprecated
10. [ ` RegExp.lastParen ($+) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastParen) Deprecated
11. [ ` RegExp.leftContext ... | |
Mmdn_RegExp/Mmdn_RegExp_3_0.txt | * Skip to main content
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[ MDN Web Docs ](/en-US/) Open main menu
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* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Regularexpressions_45_0.txt | A customized MDN experience | |
Mmdn_RegExp/Regularexpressions_70_0.txt | 1. [ JavaScript ](/en-US/docs/Web/JavaScript)
2. [ Tutorials ](/en-US/docs/Web/JavaScript/Tutorials)
3. Complete beginners
1. [ JavaScript basics ](/en-US/docs/Learn/Getting_started_with_the_web/JavaScript_basics)
2. [ JavaScript first steps ](/en-US/docs/Learn/JavaScript/First_steps)
3. [ JavaScript building blocks ](... | |
Mmdn_RegExp/toString_101_0.txt | ## Help improve MDN | |
Mmdn_RegExp/Mmdn_RegExp_28_3.txt | resents the entire match, the second `
indices ` entry represents the first capturing group, etc. Each entry itself
is a two-element array, where the first number represents the match's start
index, and the second number, its end index.
The ` indices ` array additionally has a ` groups ` property, which holds a [
` nu... | |
Mmdn_RegExp/Regularexpressions_8_0.txt | * [ CSS | |
Mmdn_RegExp/toString_104_0.txt | [ Learn how to contribute
](https://github.com/mdn/content/blob/main/CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") . | |
Mmdn_RegExp/toString_47_0.txt | * [ AI Help (beta) | |
Mmdn_RegExp/Regularexpressions_69_0.txt | * Creating a regular expression
* Writing a regular expression pattern
* Using regular expressions in JavaScript
* Examples
* Tools | |
Mmdn_RegExp/toString_113_0.txt | * [ Product help ](https://support.mozilla.org/products/mdn-plus)
* [ Report an issue ](/en-US/docs/MDN/Community/Issues) | |
Mmdn_RegExp/Regularexpressions_124_0.txt | function escapeRegExp(string) {
return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
} | |
Mmdn_RegExp/toString_15_0.txt | Protocol for transmitting web resources | |
Mmdn_RegExp/toString_117_0.txt | * [ Web Technologies ](/en-US/docs/Web)
* [ Learn Web Development ](/en-US/docs/Learn)
* [ MDN Plus ](/en-US/plus)
* [ Hacks Blog ](https://hacks.mozilla.org/) | |
Mmdn_RegExp/Regularexpressions_78_0.txt | 67. [ TypeError: can't convert BigInt to number ](/en-US/docs/Web/JavaScript/Reference/Errors/Cant_convert_BigInt_to_number)
68. [ TypeError: can't convert x to BigInt ](/en-US/docs/Web/JavaScript/Reference/Errors/Cant_convert_x_to_BigInt)
69. [ TypeError: can't define property "x": "obj" is not extensible ](/en-US/doc... | |
Mmdn_RegExp/Mmdn_RegExp_18_3.txt | haracters with ` \ ` when included in a string) are necessary.
For example, the following are equivalent:
js
const re = /\w+/;
// OR
const re = new RegExp("\\w+");
### Special handling for regexes
**Note:** Whether something is a "regex" can be [ duck-typed
](https://en.wikipedia.org/wi... | |
Mmdn_RegExp/exec_75_0.txt | The **` exec() ` ** method of [ ` RegExp ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) instances executes a
search with this regular expression for a match in a specified string and
returns a result array, or [ ` null ` ](/en-
US/docs/Web/JavaScript/Reference/Operators/null) . | |
Mmdn_RegExp/exec_104_0.txt | Property | Value
---|---
` [0] ` | ` "Quick Brown Fox Jumps" `
` [1] ` | ` "Brown" `
` [2] ` | ` "Jumps" `
` index ` | ` 4 `
` indices ` | ` [[4, 25], [10, 15], [20, 25]] `
` groups: { color: [10, 15 ]} `
` input ` | ` "The Quick Brown Fox Jumps Over The Lazy Dog" `
` groups ` | ` { color: "brown" } ` | |
Mmdn_RegExp/Mmdn_RegExp_14_0.txt | * Skip to main content
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Mmdn_RegExp/toString_123_0.txt | Non-standard | |
Mmdn_RegExp/exec_26_0.txt | * Guides [ Guides ](/en-US/docs/Learn)
* [ Overview / MDN Learning Area | |
Mmdn_RegExp/exec_60_0.txt | Search MDN Clear search input Search | |
Mmdn_RegExp/Regularexpressions_51_0.txt | All browser compatibility updates at a glance | |
Mmdn_RegExp/Regularexpressions_164_0.txt | The ` m ` flag is used to specify that a multiline input string should be
treated as multiple lines. If the ` m ` flag is used, ` ^ ` and ` $ ` match at
the start or end of any line within the input string instead of the start or
end of the entire string. | |
Mmdn_RegExp/toString_64_0.txt | Article Actions | |
Mmdn_RegExp/Regularexpressions_28_0.txt | ](/en-US/docs/Learn) | |
Mmdn_RegExp/toString_60_0.txt | Search MDN Clear search input Search | |
Mmdn_RegExp/toString_39_0.txt | Learn to run scripts in the browser | |
Mmdn_RegExp/exec_8_0.txt | * [ CSS | |
Mmdn_RegExp/Mmdn_RegExp_15_1.txt | ndex ` ](/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/toString_9_0.txt | Code used to describe document style | |
Mmdn_RegExp/toString_17_0.txt | * [ Web APIs | |
Mmdn_RegExp/Regularexpressions_191_0.txt |
#### Result | |
Mmdn_RegExp/Regularexpressions_10_0.txt | ](/en-US/docs/Web/CSS) | |
Mmdn_RegExp/Regularexpressions_205_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/Regularexpressions_201_0.txt | * [ « Previous ](/en-US/docs/Web/JavaScript/Guide/Text_formatting)
* [ Next » ](/en-US/docs/Web/JavaScript/Guide/Indexed_collections) | |
Mmdn_RegExp/Regularexpressions_148_0.txt |
The occurrences of ` /d(b+)d/g ` in the two statements are different regular
expression objects and hence have different values for their ` lastIndex `
property. If you need to access the properties of a regular expression created
with an object initializer, you should first assign it to a variable. | |
Mmdn_RegExp/toString_103_0.txt | Yes No | |
Mmdn_RegExp/toString_20_0.txt | * [ Web Extensions | |
Mmdn_RegExp/Mmdn_RegExp_13_2.txt | /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. [ ` Object.prototype.__d... | |
Mmdn_RegExp/toString_2_0.txt | * References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology | |
Mmdn_RegExp/exec_31_0.txt | ](/en-US/docs/Learn) | |
Mmdn_RegExp/Regularexpressions_80_0.txt | * Creating a regular expression
* Writing a regular expression pattern
* Using regular expressions in JavaScript
* Examples
* Tools | |
Mmdn_RegExp/javascriptregexpexer_7_0.txt | **Sample Solution:** | |
Mmdn_RegExp/Mmdn_RegExp_19_3.txt | should be
done instantly, otherwise the result might be unexpected.
## Specifications
Specification
---
[ Legacy RegExp features
# additional-properties-of-the-regexp-constructor
](https://github.com/tc39/proposal-regexp-legacy-features/#additional-
properties-of-the-regexp-constructor)
## Browser compa... | |
Mmdn_RegExp/toString_0_0.txt | * Skip to main content
* Skip to search
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Mmdn_RegExp/Mmdn_RegExp_0_5.txt | /en-US/docs/Web/JavaScript/Reference/Statements/for...of)
18. [ function ](/en-US/docs/Web/JavaScript/Reference/Statements/function)
19. [ function* ](/en-US/docs/Web/JavaScript/Reference/Statements/function*)
20. [ if...else ](/en-US/docs/Web/JavaScript/Reference/Statements/if...else)
21. [ import ](/e... | |
Mmdn_RegExp/Regularexpressions_56_0.txt | * [ FAQ | |
Mmdn_RegExp/exec_64_0.txt | Article Actions | |
Mmdn_RegExp/exec_81_0.txt | The string against which to match the regular expression. All values are [
coerced to strings ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String#string_coercion) , so
omitting it or passing ` undefined ` causes ` exec() ` to search for the
string ` "undefined" ` , which is rarely what you want. |
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