id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_RegExp/toString_10_0.txt | ](/en-US/docs/Web/CSS) | |
Mmdn_RegExp/Regularexpressions_122_0.txt | If using the ` RegExp ` constructor with a string literal, remember that the
backslash is an escape in string literals, so to use it in the regular
expression, you need to escape it at the string literal level. ` /a\*b/ ` and
` new RegExp("a\\*b") ` create the same expression, which searches for "a"
followed by a liter... | |
Mmdn_RegExp/Regularexpressions_54_0.txt | Learn how to use MDN Plus | |
Mmdn_RegExp/Regularexpressions_19_0.txt | ](/en-US/docs/Web/API) | |
Mmdn_RegExp/toString_100_0.txt | * [ ` Object.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString) | |
Mmdn_RegExp/Regularexpressions_174_0.txt |
Unicode regular expressions have different execution behavior as well. [ `
RegExp.prototype.unicode ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/unicode) contains more
explanation about this. | |
Mmdn_RegExp/Mmdn_RegExp_16_4.txt | nt ](/en-US/docs/Learn)
* [ MDN Plus ](/en-US/plus)
* [ Hacks Blog ](https://hacks.mozilla.org/)
[ Mozilla logo ](https://www.mozilla.org/)
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* [ Cookies ](https://www.mozilla.org/privacy/websites/#cookies)
* [ Legal ](https://www.mozill... | |
Mmdn_RegExp/Regularexpressions_204_0.txt | Yes No | |
Mmdn_RegExp/toString_6_0.txt | Structure of content on the web | |
Mmdn_RegExp/Regularexpressions_150_0.txt | Regular expressions have optional flags that allow for functionality like
global searching and case-insensitive searching. These flags can be used
separately or together in any order, and are included as part of the regular
expression. | |
Mmdn_RegExp/Regularexpressions_118_0.txt | ### Escaping | |
Mmdn_RegExp/Mmdn_RegExp_1_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)
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* [ HTML Structure of content on the web ](/en-US/do... | |
Mmdn_RegExp/Mmdn_RegExp_16_2.txt | obal_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. [ ` O... | |
Mmdn_RegExp/exec_117_0.txt | const matches = /(hello \S+)/.exec("This is a hello world!");
console.log(matches[1]); | |
Mmdn_RegExp/exec_5_0.txt | * [ HTML | |
Mmdn_RegExp/Mmdn_RegExp_24_4.txt | index 2 is not the beginning of the string or line
regex2.lastIndex = 2;
regex2.test(".\nfoo"); // true - index 2 is the beginning of a line
## Specifications
Specification
---
[ ECMAScript Language Specification
# sec-get-regexp.prototype.sticky ](https://tc39.es/ecma262/multipage/text-
proces... | |
Mmdn_RegExp/Regularexpressions_140_0.txt |
With these scripts, the match succeeds and returns the array and updates the
properties shown in the following table. | |
Mmdn_RegExp/Regularexpressions_105_0.txt | Groups group multiple patterns as a whole, and capturing groups provide extra
submatch information when using a regular expression pattern to match against
a string. Backreferences refer to a previously captured group in the same
regular expression. | |
Mmdn_RegExp/exec_39_0.txt | Learn to run scripts in the browser | |
Mmdn_RegExp/toString_23_0.txt | * [ Web Technology | |
Mmdn_RegExp/Mmdn_RegExp_9_3.txt | gExp ` , the `
MyRegExp ` species is the ` MyRegExp ` constructor. However, you might want to
overwrite this, in order to return parent ` RegExp ` objects in your derived
class methods:
js
class MyRegExp extends RegExp {
// Overwrite MyRegExp species to the parent RegExp constructor
static g... | |
Mmdn_RegExp/exec_41_0.txt | * [ Accessibility | |
Mmdn_RegExp/Regularexpressions_208_0.txt | [ MDN logo ](/) | |
Mmdn_RegExp/Mmdn_RegExp_29_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_103_0.txt |
The following table shows the state of ` result ` after running this script: | |
Mmdn_RegExp/javascriptregexpexer_25_0.txt | * * * | |
Mmdn_RegExp/Regularexpressions_197_0.txt | [ Regex interactive tutorial ](https://regexlearn.com/) | |
Mmdn_RegExp/Mmdn_RegExp_4_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_11_0.txt | * [ JavaScript | |
Mmdn_RegExp/Mmdn_RegExp_0_1.txt | ipt/Guide/Keyed_collections)
12. [ Working with objects ](/en-US/docs/Web/JavaScript/Guide/Working_with_objects)
13. [ Using classes ](/en-US/docs/Web/JavaScript/Guide/Using_classes)
14. [ Using promises ](/en-US/docs/Web/JavaScript/Guide/Using_promises)
15. [ JavaScript typed arrays ](/en-US/docs/Web/J... | |
Mmdn_RegExp/Regularexpressions_107_0.txt | Indicate numbers of characters or expressions to match. | |
Mmdn_RegExp/exec_49_0.txt | ](/en-US/plus/ai-help) | |
Mmdn_RegExp/Mmdn_RegExp_0_8.txt | properties ](/en-US/docs/Web/JavaScript/Reference/Errors/No_properties)
59. [ TypeError: "x" is (not) "y" ](/en-US/docs/Web/JavaScript/Reference/Errors/Unexpected_type)
60. [ TypeError: "x" is not a constructor ](/en-US/docs/Web/JavaScript/Reference/Errors/Not_a_constructor)
61. [ TypeError: "x" is not a f... | |
Mmdn_RegExp/toString_53_0.txt | * [ Documentation | |
Mmdn_RegExp/javascriptregexpexer_30_0.txt | * [ Privacy ](https://www.w3resource.com/privacy.php)
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Mmdn_RegExp/Mmdn_RegExp_16_3.txt | r}]/v;
console.log(regex.unicodeSets); // true
## Specifications
Specification
---
[ ECMAScript Language Specification
# sec-get-regexp.prototype.unicodesets
](https://tc39.es/ecma262/multipage/text-processing.html#sec-get-
regexp.prototype.unicodesets)
## Browser compatibility
BCD tables... | |
Mmdn_RegExp/Mmdn_RegExp_0_10.txt | Web/JavaScript/Reference/Global_Objects/URIError)
* [ ` InternalError ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/InternalError) Non-standard
### Numbers and dates
These are the base objects representing numbers, dates, and mathematical
calculations.
* [ ` Number ` ](/en-US/docs/Web/JavaScript/Refe... | |
Mmdn_RegExp/Regularexpressions_60_0.txt | Search MDN Clear search input Search | |
Mmdn_RegExp/toString_36_0.txt | Learn to style content using CSS | |
Mmdn_RegExp/Regularexpressions_113_0.txt | ` ( _x_ ) ` , ` (?<Name>x) ` , ` (?: _x_ ) ` , ` \ _n_ ` , ` \k<Name> ` | | |
Mmdn_RegExp/exec_50_0.txt | * [ Updates | |
Mmdn_RegExp/Regularexpressions_125_0.txt |
The "g" after the regular expression is an option or flag that performs a
global search, looking in the whole string and returning all matches. It is
explained in detail below in Advanced Searching With Flags . | |
Mmdn_RegExp/Regularexpressions_87_0.txt |
const re = /ab+c/; | |
Mmdn_RegExp/exec_4_0.txt | ](/en-US/docs/Web) | |
Mmdn_RegExp/Regularexpressions_44_0.txt | * Plus [ Plus ](/en-US/plus)
* [ Overview | |
Mmdn_RegExp/Mmdn_RegExp_20_2.txt | bal_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. [ ` Ob... | |
Mmdn_RegExp/Regularexpressions_173_0.txt | /\p{L}*/u; | |
Mmdn_RegExp/Mmdn_RegExp_22_3.txt | astIndex)
* [ ` RegExp.prototype.dotAll ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/dotAll)
* [ ` RegExp.prototype.hasIndices ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/hasIndices)
* [ ` RegExp.prototype.ignoreCase ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegE... | |
Mmdn_RegExp/javascriptregexpexer_17_0.txt | **Previous:** [ JavaScript Regular Expression exercises.
](https://www.w3resource.com/javascript-exercises/javascript-regexp-
exercises.php)
**Next:** [ Write a JavaScript program to check a credit card number ( format
9999-9999-9999-9999 ). ](https://www.w3resource.com/javascript-
exercises/javascript-regexp-exercise-... | |
Mmdn_RegExp/Regularexpressions_14_0.txt | * [ HTTP | |
Mmdn_RegExp/Mmdn_RegExp_24_5.txt | * [ Hacks Blog ](https://hacks.mozilla.org/)
[ Mozilla logo ](https://www.mozilla.org/)
* [ Website Privacy Notice ](https://www.mozilla.org/privacy/websites/)
* [ Cookies ](https://www.mozilla.org/privacy/websites/#cookies)
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* [ Community Partic... | |
Mmdn_RegExp/Mmdn_RegExp_28_4.txt | he search starts at the substring
of ` str ` specified by the regular expression's [ ` lastIndex ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex) property ( [
` test() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test)
will also advance the [ ` lastIndex ` ](/en-
US/docs/Web/... | |
Mmdn_RegExp/toString_119_0.txt | * [ Website Privacy Notice ](https://www.mozilla.org/privacy/websites/)
* [ Cookies ](https://www.mozilla.org/privacy/websites/#cookies)
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Mmdn_RegExp/Regularexpressions_134_0.txt | const myRe = /d(b+)d/g;
const myArray = myRe.exec("cdbbdbsbz"); | |
Mmdn_RegExp/Mmdn_RegExp_28_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_153_0.txt | const re = /pattern/flags; | |
Mmdn_RegExp/exec_111_0.txt | Found abb. Next match starts at 3
Found ab. Next match starts at 9 | |
Mmdn_RegExp/toString_88_0.txt | The following example displays the string value of a [ ` RegExp ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp) object: | |
Mmdn_RegExp/Regularexpressions_49_0.txt | ](/en-US/plus/ai-help) | |
Mmdn_RegExp/Mmdn_RegExp_10_4.txt | eprecated
]: Deprecated. Not for use in new websites.
*[
Deprecated
]: Deprecated. Not for use in new websites.
*[
Non-standard
]: Non-standard. Che... | |
Mmdn_RegExp/javascriptregexpexer_6_0.txt |  | |
Mmdn_RegExp/exec_138_0.txt | ## Our communities | |
Mmdn_RegExp/Regularexpressions_176_0.txt | **Note:** Several examples are also available in: | |
Mmdn_RegExp/exec_146_0.txt | ]: Deprecated. Not for use in new websites.
*[ | |
Mmdn_RegExp/exec_142_0.txt | [ Mozilla logo ](https://www.mozilla.org/) | |
Mmdn_RegExp/Mmdn_RegExp_12_3.txt | ways requires setting ` lastIndex ` . It always
matches strictly at ` lastIndex ` and does not attempt any later positions.
This is usually useful for writing parsers, when you want to match tokens only
at the current position.
js
const stringPattern = /"[^"]*"/y;
const input = `const message = "Hel... | |
Mmdn_RegExp/Regularexpressions_77_1.txt | b/JavaScript/Reference/Errors/Deprecated_source_map_pragma)
59. [ TypeError: 'x' is not iterable ](/en-US/docs/Web/JavaScript/Reference/Errors/is_not_iterable)
60. [ TypeError: "x" has no properties ](/en-US/docs/Web/JavaScript/Reference/Errors/No_properties)
61. [ TypeError: "x" is (not) "y" ](/en-US/docs/Web/JavaScri... | |
Mmdn_RegExp/exec_93_0.txt | The ` indices ` array additionally has a ` groups ` property, which holds a [
` null ` -prototype object ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects)
of all named capturing groups. The keys are the names of the capturing groups,
and each value is a two-element array, with the fi... | |
Mmdn_RegExp/exec_67_0.txt | Filter sidebar Clear filter input | |
Mmdn_RegExp/Regularexpressions_72_0.txt | 41. [ Map ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
42. [ Math ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math)
43. [ NaN ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN)
44. [ Number ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)
45. [ Object ](/en-US/docs/Web/JavaS... | |
Mmdn_RegExp/Regularexpressions_77_0.txt | 27. [ SyntaxError: continue must be inside loop ](/en-US/docs/Web/JavaScript/Reference/Errors/Bad_continue)
28. [ SyntaxError: for-in loop head declarations may not have initializers ](/en-US/docs/Web/JavaScript/Reference/Errors/Invalid_for-in_initializer)
29. [ SyntaxError: function statement requires a name ](/en-US/... | |
Mmdn_RegExp/javascriptregexpexer_15_0.txt | See the Pen [ javascript-regexp-exercise-1
](https://codepen.io/w3resource/pen/jeWKqq/) by w3resource ( [ @w3resource
](https://codepen.io/w3resource) ) on [ CodePen ](https://codepen.io) . | |
Mmdn_RegExp/exec_57_0.txt | Frequently asked questions about MDN Plus | |
Mmdn_RegExp/toString_41_0.txt | * [ Accessibility | |
Mmdn_RegExp/exec_91_0.txt | ` indices ` Optional | |
Mmdn_RegExp/Regularexpressions_216_0.txt | * [ MDN Community ](/en-US/community)
* [ MDN Forum ](https://discourse.mozilla.org/c/mdn/236)
* [ MDN Chat ](/discord) | |
Mmdn_RegExp/javascriptregexpexer_16_0.txt | **Improve this sample solution and post your code through Disqus.** | |
Mmdn_RegExp/toString_70_0.txt | 1. [ Standard built-in objects ](/en-US/docs/Web/JavaScript/Reference/Global_Objects)
2. [ ` RegExp ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
3. Constructor
1. [ ` RegExp() constructor ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp)
4. Static properties
1. [ ` RegExp[@@speci... | |
Mmdn_RegExp/Regularexpressions_177_0.txt | * The reference pages for [ ` exec() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec) , [ ` test() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/test) , [ ` match() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match) , [ ` matchAll() ` ](/en-US/docs/Web/JavaScript/... | |
Mmdn_RegExp/Mmdn_RegExp_6_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_10_3.txt | er 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_Objects/RegExp/last... | |
Mmdn_RegExp/Regularexpressions_143_0.txt | const myRe = /d(b+)d/g;
const myArray = myRe.exec("cdbbdbsbz");
console.log(`The value of lastIndex is ${myRe.lastIndex}`); | |
Mmdn_RegExp/Mmdn_RegExp_1_2.txt | ocs/Web/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/__defineGet... | |
Mmdn_RegExp/exec_139_0.txt | * [ MDN Community ](/en-US/community)
* [ MDN Forum ](https://discourse.mozilla.org/c/mdn/236)
* [ MDN Chat ](/discord) | |
Mmdn_RegExp/exec_63_0.txt | 1. [ References ](/en-US/docs/Web)
2. [ JavaScript ](/en-US/docs/Web/JavaScript)
3. [ Reference ](/en-US/docs/Web/JavaScript/Reference)
4. [ Standard built-in objects ](/en-US/docs/Web/JavaScript/Reference/Global_Objects)
5. [ RegExp ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
6. [ RegExp.prototy... | |
Mmdn_RegExp/exec_42_0.txt | Learn to make the web accessible to all | |
Mmdn_RegExp/toString_46_0.txt | ](/en-US/plus) | |
Mmdn_RegExp/toString_108_0.txt | Your blueprint for a better internet. | |
Mmdn_RegExp/exec_37_0.txt | ](/en-US/docs/Learn/CSS) | |
Mmdn_RegExp/Regularexpressions_179_0.txt | In the following example, the user is expected to enter a phone number. When
the user presses the "Check" button, the script checks the validity of the
number. If the number is valid (matches the character sequence specified by
the regular expression), the script shows a message thanking the user and
confirming the num... | |
Mmdn_RegExp/exec_132_0.txt | Your blueprint for a better internet. | |
Mmdn_RegExp/toString_90_0.txt | const foo = new RegExp("bar", "g");
console.log(foo.toString()); // '/bar/g' | |
Mmdn_RegExp/exec_126_0.txt | Was this page helpful to you? | |
Mmdn_RegExp/exec_6_0.txt | Structure of content on the web | |
Mmdn_RegExp/Regularexpressions_65_0.txt | * English (US) | |
Mmdn_RegExp/Regularexpressions_79_0.txt | ## In this article | |
Mmdn_RegExp/exec_90_0.txt | A [ ` null ` -prototype object ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/Object#null-prototype_objects)
of named capturing groups, whose keys are the names, and values are the
capturing groups, or [ ` undefined ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/undefined) if no named
capturing groups... | |
Mmdn_RegExp/Mmdn_RegExp_0_4.txt | JavaScript/Reference/Operators/Multiplication_assignment)
48. [ new ](/en-US/docs/Web/JavaScript/Reference/Operators/new)
49. [ new.target ](/en-US/docs/Web/JavaScript/Reference/Operators/new.target)
50. [ null ](/en-US/docs/Web/JavaScript/Reference/Operators/null)
51. [ Nullish coalescing assignment (?... | |
Mmdn_RegExp/Regularexpressions_99_0.txt | The following pages provide lists of the different special characters that fit
into each category, along with descriptions and examples. | |
Mmdn_RegExp/exec_59_0.txt | * [ Curriculum New ](/en-US/curriculum/)
* [ Blog ](/en-US/blog/)
* [ Play ](/en-US/play)
* [ AI Help Beta ](/en-US/plus/ai-help) |
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