id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
Mmdn_RegExp/Mmdn_RegExp_18_7.txt | r newer
"x".replace(/x(.)?/g, (m, group) => {
console.log(`group: ${group}`);
});
// group: undefined
Note that due to web compatibility, ` RegExp.$N ` will still return an empty
string instead of ` undefined ` ( [ bug 1053944 ](https://bugzil.la/1053944)
).
## See also
* [ Polyfill of many... | |
Mmdn_RegExp/Regularexpressions_114_0.txt | [ Groups and backreferences ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences) | |
Mmdn_RegExp/toString_121_0.txt | Deprecated | |
Mmdn_RegExp/Mmdn_RegExp_27_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_53_0.txt | * [ Documentation | |
Mmdn_RegExp/Mmdn_RegExp_28_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_46_0.txt | ](/en-US/plus) | |
Mmdn_RegExp/toString_78_0.txt | toString() | |
Mmdn_RegExp/Mmdn_RegExp_8_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/Regularexpressions_175_0.txt | ## Examples | |
Mmdn_RegExp/Regularexpressions_160_0.txt | const re = /\w+\s/g; | |
Mmdn_RegExp/exec_2_0.txt | * References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology | |
Mmdn_RegExp/toString_62_0.txt | * [ Log in ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FRegExp%2FtoString)
* [ Sign up for free ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FRegExp%2FtoString) | |
Mmdn_RegExp/Regularexpressions_138_0.txt | If you want to construct the regular expression from a string, yet another
alternative is this script: | |
Mmdn_RegExp/toString_34_0.txt | ](/en-US/docs/Learn/HTML) | |
Mmdn_RegExp/Regularexpressions_203_0.txt | Was this page helpful to you? | |
Mmdn_RegExp/Mmdn_RegExp_27_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/Mmdn_RegExp_9_2.txt | pt/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__) Deprecate... | |
Mmdn_RegExp/Regularexpressions_2_0.txt | * References [ References ](/en-US/docs/Web)
* [ Overview / Web Technology | |
Mmdn_RegExp/toString_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/Regularexpressions_15_0.txt | Protocol for transmitting web resources | |
Mmdn_RegExp/Mmdn_RegExp_16_0.txt | * Skip to main content
* Skip to search
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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/Mmdn_RegExp_14_3.txt | `
subclasses.
## Examples
### Direct call
This method can be used in almost the same way as [ `
String.prototype.search() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/String/search) , except for
the different value of ` this ` and the different arguments order.
js
const re = /-/g;
... | |
Mmdn_RegExp/Mmdn_RegExp_26_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/Regularexpressions_141_0.txt | Results of regular expression execution. Object | Property or index |
Description | In this example
---|---|---|---
` myArray ` | | The matched string and all remembered substrings. | `
['dbbd', 'bb', index: 1, input: 'cdbbdbsbz'] `
` index ` | The 0-based index of the match in the input string. | ` 1 `
` ... | |
Mmdn_RegExp/Mmdn_RegExp_13_1.txt | /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. [ ` RegEx... | |
Mmdn_RegExp/exec_33_0.txt | Learn to structure web content with HTML | |
Mmdn_RegExp/toString_80_0.txt | None. | |
Mmdn_RegExp/exec_112_0.txt |
**Warning:** There are many pitfalls that can lead to this becoming an
infinite loop! | |
Mmdn_RegExp/Regularexpressions_154_0.txt | const re = new RegExp("pattern", "flags"); | |
Mmdn_RegExp/Regularexpressions_206_0.txt | This page was last modified on Jan 2, 2024 by [ MDN contributors ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/contributors.txt) . | |
Mmdn_RegExp/Regularexpressions_29_0.txt | * [ MDN Learning Area | |
Mmdn_RegExp/Mmdn_RegExp_26_3.txt | appended to the result array. Then, the capturing groups' values are appended one-by-one.
* If the current match is an empty string, or if the regexp doesn't match at the current position (since it's sticky), the ` lastIndex ` would still be advanced â if the regex is [ Unicode-aware ](/en-US/docs/Web/JavaScript/... | |
Mmdn_RegExp/exec_109_0.txt | const myRe = /ab*/g;
const str = "abbcdefabh";
let myArray;
while ((myArray = myRe.exec(str)) !== null) {
let msg = `Found ${myArray[0]}. `;
msg += `Next match starts at ${myRe.lastIndex}`;
console.log(msg);
} | |
Mmdn_RegExp/Mmdn_RegExp_2_3.txt | cky) ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky)
Matches only from the index indicated by the ` lastIndex ` property of this
regular expression in the target string. Does not attempt to match from any
later indexes.
### Return value
` RegExp(pattern) ` returns ` pattern ` directly if... | |
Mmdn_RegExp/exec_69_0.txt | * Try it
* Syntax
* Description
* Examples
* Specifications
* Browser compatibility
* See also | |
Mmdn_RegExp/toString_83_0.txt | ## Description | |
Mmdn_RegExp/exec_76_0.txt | ## Try it | |
Mmdn_RegExp/Regularexpressions_37_0.txt | ](/en-US/docs/Learn/CSS) | |
Mmdn_RegExp/Mmdn_RegExp_19_4.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 i... | |
Mmdn_RegExp/exec_123_0.txt | ## See also | |
Mmdn_RegExp/exec_129_0.txt | This page was last modified on Sep 25, 2023 by [ MDN contributors ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec/contributors.txt)
. | |
Mmdn_RegExp/Mmdn_RegExp_17_2.txt | e/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/exec_97_0.txt | ` exec() ` is the primitive method of regexps. Many other regexp methods call
` exec() ` internally â including those called by string methods, like [ `
@@replace ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@replace) . While `
exec() ` itself is powerful (and is the most efficient), it often does... | |
Mmdn_RegExp/Regularexpressions_200_0.txt | An online visual regex tester. | |
Mmdn_RegExp/javascriptregexpexer_19_0.txt | Easy Medium Hard | |
Mmdn_RegExp/Mmdn_RegExp_19_0.txt | * Skip to main content
* Skip to search
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[ 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/Regularexpressions_26_0.txt | * Guides [ Guides ](/en-US/docs/Learn)
* [ Overview / MDN Learning Area | |
Mmdn_RegExp/Mmdn_RegExp_0_3.txt | t/Reference/Operators/Assignment)
5. [ async function expression ](/en-US/docs/Web/JavaScript/Reference/Operators/async_function)
6. [ async function* expression ](/en-US/docs/Web/JavaScript/Reference/Operators/async_function*)
7. [ await ](/en-US/docs/Web/JavaScript/Reference/Operators/await)
8. [ Bitw... | |
Mmdn_RegExp/Mmdn_RegExp_7_2.txt | or)
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.__defineSette... | |
Mmdn_RegExp/Regularexpressions_38_0.txt | * [ JavaScript | |
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Mmdn_RegExp/Regularexpressions_22_0.txt | ](/en-US/docs/Mozilla/Add-ons/WebExtensions) | |
Mmdn_RegExp/Regularexpressions_83_0.txt | Regular expressions are patterns used to match character combinations in
strings. In JavaScript, regular expressions are also objects. These patterns
are used with the [ ` exec() ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec) and [ ` test() `
](/en-US/docs/Web/JavaScript/Reference/Global_Objects/... | |
Mmdn_RegExp/javascriptregexpexer_21_0.txt | Follow us on [ Facebook
](https://www.facebook.com/W3resource-103553425799800) and [ Twitter
](https://twitter.com/w3resource) for latest update. | |
Mmdn_RegExp/Regularexpressions_50_0.txt | * [ Updates | |
Mmdn_RegExp/Mmdn_RegExp_29_1.txt | [ ` 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/lastPar... | |
Mmdn_RegExp/toString_3_0.txt | Web technology reference for developers | |
Mmdn_RegExp/Mmdn_RegExp_18_6.txt |
### Using a regular expression with the sticky flag
The [ ` sticky ` ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky) flag indicates
that the regular expression performs sticky matching in the target string by
attempting to match starting at [ ` RegExp.prototype.lastIndex ` ](/en-
US/docs/Web... | |
Mmdn_RegExp/toString_99_0.txt | ## See also | |
Mmdn_RegExp/toString_56_0.txt | * [ FAQ | |
Mmdn_RegExp/Regularexpressions_221_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-
US/docs/MDN/Writing_guideli... | |
Mmdn_RegExp/Regularexpressions_110_0.txt | [ Character classes ](/en-
US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes) | |
Mmdn_RegExp/Mmdn_RegExp_2_4.txt | ul to you?
Yes No
[ Learn how to contribute
](https://github.com/mdn/content/blob/main/CONTRIBUTING.md "This will take you
to our contribution guidelines on GitHub.") .
This page was last modified on Sep 7, 2023 by [ MDN contributors ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp/contributo... | |
Mmdn_RegExp/Regularexpressions_121_0.txt | To match a literal backslash, you need to escape the backslash. For instance,
to match the string "C:\" where "C" can be any letter, you'd use ` /[A-Z]:\\/
` â the first backslash escapes the one after it, so the expression searches
for a single literal backslash. | |
Mmdn_RegExp/Regularexpressions_33_0.txt | Learn to structure web content with HTML | |
Mmdn_RegExp/Regularexpressions_145_0.txt |
However, if you have this script: | |
Mmdn_RegExp/Mmdn_RegExp_21_4.txt | st modified on Jun 22, 2023 by [ MDN contributors ](/en-
US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/@@match/contributors.txt)
.
[ View this page on GitHub
](https://github.com/mdn/content/blob/main/files/en-
us/web/javascript/reference/global_objects/regexp/@@match/index.md?plain=1
"Folder: en-us/web/ja... | |
Mmdn_RegExp/javascriptregexpexer_10_0.txt | Output: | |
Mmdn_RegExp/exec_29_0.txt | * [ MDN Learning Area | |
Mmdn_RegExp/exec_20_0.txt | * [ Web Extensions | |
Mmdn_RegExp/Mmdn_RegExp_24_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/Regularexpressions_137_0.txt |
(See Using the global search flag with ` exec() ` for further info about the
different behaviors.) | |
Mmdn_RegExp/Regularexpressions_62_0.txt | * [ Log in ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FGuide%2FRegular_expressions)
* [ Sign up for free ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FGuide%2FRegular_expressions) | |
Mmdn_RegExp/toString_5_0.txt | * [ HTML | |
Mmdn_RegExp/toString_93_0.txt | new RegExp().toString(); // "/(?:)/" | |
Mmdn_RegExp/exec_125_0.txt | ## Help improve MDN | |
Mmdn_RegExp/Regularexpressions_162_0.txt | const re = new RegExp("\\w+\\s", "g"); | |
Mmdn_RegExp/Mmdn_RegExp_7_1.txt | eb/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. [ ` RegExp.leftC... | |
Mmdn_RegExp/Mmdn_RegExp_14_4.txt | o ](/)
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Snowflake offers a powerful and flexible set of tools for ingesting data from cloud storage platforms, including Amazon S3. One of the most efficient workflows involves using Snowflake’s external stage feature in combination with the `COPY INTO` co... | |
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