id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_RegExp/toString_74_0.txt | # RegExp.prototype.toString() | |
Mmdn_RegExp/Mmdn_RegExp_0_6.txt | -capturing_group)
15. [ Quantifier: *, +, ?, {n}, {n,}, {n,m} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Quantifier)
16. [ Unicode character class escape: \p{...}, \P{...} ](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape)
17. [ Wildcard: . ](/en-US/do... | |
Mmdn_RegExp/toString_102_0.txt | Was this page helpful to you? | |
Mmdn_RegExp/Mmdn_RegExp_22_4.txt | uidelines/Attrib_copyright_license) .
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
Non-standard
]: Non-standard. Check cross-browser support before using.
| |
Mmdn_RegExp/exec_114_0.txt | You can usually replace this kind of code with [ ` String.prototype.matchAll()
` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll) to
make it less error-prone. | |
Mmdn_RegExp/Mmdn_RegExp_5_1.txt | cated
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/R... | |
Mmdn_RegExp/Regularexpressions_12_0.txt | General-purpose scripting language | |
Mmdn_RegExp/exec_107_0.txt | If your regular expression uses the [ ` g ` ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions#advanced_searching_with_flags)
flag, you can use the ` exec() ` method multiple times to find successive
matches in the same string. When you do so, the search starts at the substring
of ` str ` specified by the regular ... | |
Mmdn_RegExp/Mmdn_RegExp_11_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/exec_15_0.txt | Protocol for transmitting web resources | |
Mmdn_RegExp/Mmdn_RegExp_2_2.txt | ect/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.... | |
Mmdn_RegExp/Regularexpressions_222_0.txt | Deprecated | |
Mmdn_RegExp/javascriptregexpexer_8_0.txt | **JavaScript Code:** | |
Mmdn_RegExp/Regularexpressions_111_0.txt | ` ^ ` , ` $ ` , ` \b ` , ` \B ` , ` x(?=y) ` , ` x(?!y) ` , ` (?<=y)x ` , `
(?<!y)x ` | | |
Mmdn_RegExp/toString_85_0.txt | In practice, it reads the regex's [ ` source ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/source) and [ ` flags `
](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags) properties
and returns a string in the form ` /source/flags ` . The ` toString() ` return
value is guaranteed to be a p... | |
Mmdn_RegExp/exec_115_0.txt | ### Using exec() with RegExp literals | |
Mmdn_RegExp/Mmdn_RegExp_27_4.txt | new websites.
*[
Non-standard
]: Non-standard. Check cross-browser support before using.
| |
Mmdn_RegExp/Regularexpressions_123_0.txt | If escape strings are not already part of your pattern you can add them using
[ ` String.prototype.replace() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String/replace) : | |
Mmdn_RegExp/exec_30_0.txt | Learn web development | |
Mmdn_RegExp/Mmdn_RegExp_24_3.txt | chAll) (which calls [ ` RegExp.prototype[@@matchAll]() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@matchAll) ): ` y ` , ` g ` and ` gy ` are all different.
* For ` y ` regexes: ` matchAll() ` throws; ` [@@matchAll]() ` yields the ` exec() ` result exactly once, without updating the regex's ` l... | |
Mmdn_RegExp/toString_16_0.txt | ](/en-US/docs/Web/HTTP) | |
Mmdn_RegExp/Mmdn_RegExp_11_3.txt | s content
](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-
url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-
US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FRegExp%2Fflags&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2... | |
Mmdn_RegExp/Regularexpressions_23_0.txt | * [ Web Technology | |
Mmdn_RegExp/Regularexpressions_13_0.txt | ](/en-US/docs/Web/JavaScript) | |
Mmdn_RegExp/Mmdn_RegExp_5_0.txt | * Skip to main content
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Mmdn_RegExp/Regularexpressions_120_0.txt | Similarly, if you're writing a regular expression literal and need to match a
slash ("/"), you need to escape that (otherwise, it terminates the pattern).
For instance, to search for the string "/example/" followed by one or more
alphabetic characters, you'd use ` /\/example\/[a-z]+/i ` âthe backslashes
before each s... | |
Mmdn_RegExp/Mmdn_RegExp_3_3.txt | md?plain=1
"Folder: en-us/web/javascript/reference/global_objects/regexp/source \(Opens
in a new tab\)") ⢠[ Report a problem with this content
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Mmdn_RegExp/Mmdn_RegExp_4_0.txt | * Skip to main content
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Mmdn_RegExp/Mmdn_RegExp_2_0.txt | * Skip to main content
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Mmdn_RegExp/exec_0_0.txt | * Skip to main content
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* Skip to select language | |
Mmdn_RegExp/Mmdn_RegExp_25_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/toString_82_0.txt | A string representing the given object. | |
Mmdn_RegExp/Mmdn_RegExp_26_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_25_2.txt | 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. [ ` Object.prototy... | |
Mmdn_RegExp/exec_124_0.txt | * [ Regular expressions ](/en-US/docs/Web/JavaScript/Guide/Regular_expressions) guide
* [ ` RegExp ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) | |
Mmdn_RegExp/Mmdn_RegExp_23_2.txt | rence/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__) Deprecated
... | |
Mmdn_RegExp/exec_3_0.txt | Web technology reference for developers | |
Mmdn_RegExp/exec_89_0.txt | ` groups ` | |
Mmdn_RegExp/Mmdn_RegExp_27_3.txt | ce/Global_Objects/RegExp/input)
* [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastMatch)
* [ ` RegExp.leftContext ($`) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/leftContext)
* [ ` RegExp.rightContext ($') ` ](/en-US/docs/Web/JavaScript/Reference/Gl... | |
Mmdn_RegExp/Mmdn_RegExp_8_4.txt | ](/)
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Mmdn_RegExp/toString_84_0.txt | The [ ` RegExp ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
object overrides the ` toString() ` method of the [ ` Object ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Object) object; it does not
inherit [ ` Object.prototype.toString() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Object... | |
Mmdn_RegExp/Regularexpressions_215_0.txt | ## Our communities | |
Mmdn_RegExp/Regularexpressions_76_1.txt | er ](/en-US/docs/Web/JavaScript/Reference/Errors/Reserved_identifier)
22. [ SyntaxError: a declaration in the head of a for-of loop can't have an initializer ](/en-US/docs/Web/JavaScript/Reference/Errors/Invalid_for-of_initializer)
23. [ SyntaxError: applying the 'delete' operator to an unqualified name is deprecated ]... | |
Mmdn_RegExp/toString_51_0.txt | All browser compatibility updates at a glance | |
Mmdn_RegExp/Mmdn_RegExp_22_2.txt | ects/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. [ ` Object.pr... | |
Mmdn_RegExp/toString_18_0.txt | Interfaces for building web applications | |
Mmdn_RegExp/toString_38_0.txt | * [ JavaScript | |
Mmdn_RegExp/exec_13_0.txt | ](/en-US/docs/Web/JavaScript) | |
Mmdn_RegExp/Regularexpressions_161_0.txt |
with: | |
Mmdn_RegExp/Regularexpressions_207_0.txt | [ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/javascript/guide/regular_expressions/index.md?plain=1 "Folder: en-
us/web/javascript/guide/regular_expressions \(Opens in a new tab\)") ⢠[
Report a problem with this content
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Mmdn_RegExp/Regularexpressions_32_0.txt | * [ HTML | |
Mmdn_RegExp/Regularexpressions_11_0.txt | * [ JavaScript | |
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Mmdn_RegExp/Mmdn_RegExp_3_2.txt | ects/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. [ ` Object.pr... | |
Mmdn_RegExp/toString_30_0.txt | Learn web development | |
Mmdn_RegExp/Mmdn_RegExp_15_4.txt | es ](/en-US/docs/Web)
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Mmdn_RegExp/javascriptregexpexer_18_0.txt | **What is the difficulty level of this exercise?** | |
Mmdn_RegExp/Regularexpressions_61_0.txt | Theme | |
Mmdn_RegExp/toString_77_0.txt | ## Syntax | |
Mmdn_RegExp/toString_25_0.txt | ](/en-US/docs/Web) | |
Mmdn_RegExp/exec_147_0.txt | Non-standard | |
Mmdn_RegExp/Regularexpressions_131_0.txt | Method | Description
---|---
[ ` exec() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec) | Executes a
search for a match in a string. It returns an array of information or ` null `
on a mismatch.
[ ` test() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test) | Tests for a
matc... | |
Mmdn_RegExp/Mmdn_RegExp_1_3.txt | ed.
When the regex is sticky and global, it will still perform sticky matches â
i.e. it will not match any occurrences beyond the ` lastIndex ` .
js
console.log(Array.from("ab-c".matchAll(/[abc]/gy)));
// [ [ "a" ], [ "b" ] ]
If the current match is an empty string, the [ ` lastIndex ` ](/e... | |
Mmdn_RegExp/toString_79_0.txt |
### Parameters | |
Mmdn_RegExp/toString_35_0.txt | * [ CSS | |
Mmdn_RegExp/Mmdn_RegExp_9_4.txt | plus)
* [ Report an issue ](/en-US/docs/MDN/Community/Issues)
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Mmdn_RegExp/Mmdn_RegExp_20_3.txt |
## Browser compatibility
BCD tables only load in the browser with JavaScript enabled. Enable
JavaScript to view data.
## See also
* [ ` RegExp.input ($_) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/input)
* [ ` RegExp.lastMatch ($&) ` ](/en-US/docs/Web/JavaScript/Reference/Global_Obje... | |
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Mmdn_RegExp/Mmdn_RegExp_14_2.txt | JavaScript/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__) D... | |
Mmdn_RegExp/toString_73_0.txt | * Try it
* Syntax
* Description
* Examples
* Specifications
* Browser compatibility
* See also | |
Mmdn_RegExp/Regularexpressions_25_0.txt | ](/en-US/docs/Web) | |
Mmdn_RegExp/Regularexpressions_146_0.txt | const myArray = /d(b+)d/g.exec("cdbbdbsbz");
console.log(`The value of lastIndex is ${/d(b+)d/g.lastIndex}`); | |
Mmdn_RegExp/exec_140_0.txt | ## Developers | |
Mmdn_RegExp/Regularexpressions_84_0.txt | ## Creating a regular expression | |
Mmdn_RegExp/exec_16_0.txt | ](/en-US/docs/Web/HTTP) | |
Mmdn_RegExp/Regularexpressions_167_0.txt | const str = "fee fi fo fum";
const re = /\w+\s/g; | |
Mmdn_RegExp/Regularexpressions_149_0.txt | ### Advanced searching with flags | |
Mmdn_RegExp/Regularexpressions_108_0.txt | If you want to look at all the special characters that can be used in regular
expressions in a single table, see the following: | |
Mmdn_RegExp/exec_52_0.txt | ](/en-US/plus/updates) | |
Mmdn_RegExp/exec_17_0.txt | * [ Web APIs | |
Mmdn_RegExp/exec_14_0.txt | * [ HTTP | |
Mmdn_RegExp/Regularexpressions_157_0.txt | const re = /\w+\s/g;
const str = "fee fi fo fum";
const myArray = str.match(re);
console.log(myArray); | |
Mmdn_RegExp/exec_85_0.txt | ` index ` | |
Mmdn_RegExp/javascriptregexpexer_22_0.txt | * * * | |
Mmdn_RegExp/toString_37_0.txt | ](/en-US/docs/Learn/CSS) | |
Mmdn_RegExp/Regularexpressions_18_0.txt | Interfaces for building web applications | |
Mmdn_RegExp/javascriptregexpexer_29_0.txt | ©w3resource.com 2011-2024 | |
Mmdn_RegExp/exec_22_0.txt | ](/en-US/docs/Mozilla/Add-ons/WebExtensions) | |
Mmdn_RegExp/toString_120_0.txt | Visit [ Mozilla Corporationâs ](https://www.mozilla.org) not-for-profit
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-
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Mmdn_RegExp/Regularexpressions_130_0.txt | Regular expressions are used with the [ ` RegExp ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) methods [ ` test() `
](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test) and [ `
exec() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec)
and with the [ ` String ` ](/en-
U... | |
Mmdn_RegExp/toString_24_0.txt | Web technology reference for developers | |
Mmdn_RegExp/exec_127_0.txt | Yes No | |
Mmdn_RegExp/exec_100_0.txt | ### Using exec() | |
Mmdn_RegExp/Regularexpressions_88_0.txt |
Regular expression literals provide compilation of the regular expression when
the script is loaded. If the regular expression remains constant, using this
can improve performance. | |
Mmdn_RegExp/Mmdn_RegExp_12_2.txt | nce/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__) Deprecated
2.... | |
Mmdn_RegExp/Mmdn_RegExp_6_2.txt | rence/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__) Deprecated
... | |
Mmdn_RegExp/Regularexpressions_58_0.txt | ](/en-US/plus/docs/faq) | |
Mmdn_RegExp/Mmdn_RegExp_9_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/las... | |
Mmdn_RegExp/Regularexpressions_127_0.txt | ### Using parentheses | |
Mmdn_RegExp/javascriptregexpexer_9_0.txt | function upper_case(str)
{
regexp = /^[A-Z]/;
if (regexp.test(str))
{
console.log("String's first character is uppercase");
}
else
{
console.log("String's first character is not uppercase");
}
}
upper_case('Abcd');
upper_case('abcd'); |
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