Regex reference

files/en-us/_redirects.txt

@@ -12274,6 +12274,7 @@
 /en-US/docs/Web/JavaScript/Guide/Predefined_Core_Objects	/en-US/docs/Web/JavaScript/Guide
 /en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Boundaries	/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions
 /en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Groups_and_Ranges	/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences
+/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes	/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape
 /en-US/docs/Web/JavaScript/Guide/Sameness	/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness
 /en-US/docs/Web/JavaScript/Guide/Statements	/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling
 /en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol	/en-US/docs/Web/JavaScript/Reference/Iteration_protocols

files/en-us/_wikihistory.json

@@ -104778,21 +104778,6 @@
       "jpmedley"
     ]
   },
-  "Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes": {
-    "modified": "2020-07-12T19:11:35.411Z",
-    "contributors": [
-      "JNa0",
-      "hinell",
-      "wbamberg",
-      "fscholz",
-      "SphinxKnight",
-      "dennisja",
-      "chrisdavidmills",
-      "Windrill",
-      "Artoria2e5",
-      "jpmedley"
-    ]
-  },
   "Web/JavaScript/Guide/Text_formatting": {
     "modified": "2020-05-25T10:48:56.137Z",
     "contributors": [

files/en-us/mozilla/firefox/releases/78/index.md

@@ -49,7 +49,7 @@ See also [New in Firefox 78: DevTools improvements, new regex engine, and abunda
 
   - [Lookbehind assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions) ([Firefox bug 1225665](https://bugzil.la/1225665))
   - {{JSxRef("RegExp.prototype.dotAll")}} ([Firefox bug 1361856](https://bugzil.la/1361856))
-  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes) ([Firefox bug 1361876](https://bugzil.la/1361876))
+  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape) ([Firefox bug 1361876](https://bugzil.la/1361876))
   - [Named capture groups](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences) ([Firefox bug 1362154](https://bugzil.la/1362154))
 
 - Due to a [WebIDL spec change](https://github.com/whatwg/webidl/pull/357) in mid-2020, we've [added a `Symbol.toStringTag` property to all DOM prototype objects](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag#tostringtag_available_on_all_dom_prototype_objects) ([Firefox bug 1277799](https://bugzil.la/1277799)).

files/en-us/web/javascript/guide/regular_expressions/assertions/index.md

@@ -297,7 +297,6 @@ console.log(ripeOranges); // [ 'ripe orange A', 'ripe orange C' ]
 
   - [Character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes)
   - [Quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers)
-  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
   - [Groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences)
 
 - [The `RegExp()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)

files/en-us/web/javascript/guide/regular_expressions/character_classes/index.md

@@ -253,7 +253,7 @@ Character classes distinguish kinds of characters such as, for example, distingu
       <td>
         Matches a character based on its
         <a
-          href="/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes"
+          href="/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape"
           >Unicode character properties</a
         >
         (to match just, for example, emoji characters, or Japanese
@@ -374,7 +374,6 @@ console.log("Number of vowels:", aliceExcerpt.match(regexpVowels).length);
 
   - [Assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions)
   - [Quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers)
-  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
   - [Groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences)
 
 - [The `RegExp()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)

files/en-us/web/javascript/guide/regular_expressions/cheatsheet/index.md

@@ -609,7 +609,7 @@ This page provides an overall cheat sheet of all the capabilities of `RegExp` sy
 
 [Quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers) indicate numbers of characters or expressions to match.
 
-> **Note:** In the following, _item_ refers not only to singular characters, but also includes [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes), [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes), [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences).
+> **Note:** In the following, _item_ refers not only to singular characters, but also includes [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes) and [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences).
 
 <table class="standard-table">
   <thead>
@@ -734,37 +734,3 @@ This page provides an overall cheat sheet of all the capabilities of `RegExp` sy
     </tr>
   </tbody>
 </table>
-
-## Unicode property escapes
-
-[Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes) allow for matching characters based on their Unicode properties.
-
-```js
-// Non-binary values
-/\p{UnicodePropertyValue}/
-/\p{UnicodePropertyName=UnicodePropertyValue}/
-
-// Binary and non-binary values
-/\p{UnicodeBinaryPropertyName}/
-
-// Negation: \P is negated \p
-/\P{UnicodePropertyValue}/
-/\P{UnicodeBinaryPropertyName}/
-```
-
-- `UnicodeBinaryPropertyName`
-  - : The name of a [binary property](https://tc39.es/ecma262/multipage/text-processing.html#table-binary-unicode-properties). E.g.: [`ASCII`](https://unicode.org/reports/tr18/#General_Category_Property), [`Alpha`](https://unicode.org/reports/tr44/#Alphabetic), `Math`, [`Diacritic`](https://unicode.org/reports/tr44/#Diacritic), [`Emoji`](https://unicode.org/reports/tr51/#Emoji_Properties), [`Hex_Digit`](https://unicode.org/reports/tr44/#Hex_Digit), `Math`, [`White_space`](https://unicode.org/reports/tr44/#White_Space), etc. See [Unicode Data PropList.txt](https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt) for more info.
-- `UnicodePropertyName`
-
-  - : The name of a [non-binary](https://tc39.es/ecma262/multipage/text-processing.html#table-nonbinary-unicode-properties) property:
-
-    - [General_Category](https://unicode.org/reports/tr18/#General_Category_Property) (`gc`)
-    - [Script](https://unicode.org/reports/tr24/#Script) (`sc`)
-    - [Script_Extensions](https://unicode.org/reports/tr24/#Script_Extensions) (`scx`)
-
-    See also [PropertyValueAliases.txt](https://www.unicode.org/Public/UCD/latest/ucd/PropertyValueAliases.txt)
-
-- `UnicodePropertyValue`
-  - : One of the tokens listed in the Values section, below. Many values have aliases or shorthand (e.g. the value `Decimal_Number` for the `General_Category` property may be written `Nd`, `digit`, or `Decimal_Number`). For most values, the `UnicodePropertyName` part and equals sign may be omitted. If a `UnicodePropertyName` is specified, the value must correspond to the property type given.
-
-> **Note:** As there are many properties and values available, we will not describe them exhaustively here but rather provide various examples.

files/en-us/web/javascript/guide/regular_expressions/groups_and_backreferences/index.md

@@ -196,7 +196,6 @@ console.log(lines.join("\n"));
   - [Character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes)
   - [Assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions)
   - [Quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers)
-  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
 
 - [The `RegExp()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)
 - [ClassRanges in the ECMAScript specification](https://tc39.es/ecma262/multipage/text-processing.html#sec-classranges)

files/en-us/web/javascript/guide/regular_expressions/index.md

@@ -63,8 +63,6 @@ The following pages provide lists of the different special characters that fit i
   - : 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.
 - [Quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers)
   - : Indicate numbers of characters or expressions to match.
-- [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
-  - : Distinguish based on unicode character properties, for example, upper- and lower-case letters, math symbols, and punctuation.
 
 If you want to look at all the special characters that can be used in regular expressions in a single table, see the following:
 
@@ -142,18 +140,6 @@ If you want to look at all the special characters that can be used in regular ex
         </p>
       </td>
     </tr>
-    <tr>
-      <td>
-        <code>\p{<em>UnicodeProperty</em>}</code>,
-        <code>\P{<em>UnicodeProperty</em>}</code>
-      </td>
-      <td>
-        <a
-          href="/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes"
-          >Unicode property escapes</a
-        >
-      </td>
-    </tr>
   </tbody>
 </table>
 
@@ -394,28 +380,20 @@ console.log(str.match(re)); // ["fee ", "fi ", "fo "]
 
 #### Using unicode regular expressions
 
-The "u" flag is used to create "unicode" regular expressions; that is, regular expressions which support matching against unicode text. This is mainly accomplished through the use of [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes), which are supported only within "unicode" regular expressions.
-
-For example, the following regular expression might be used to match against an arbitrary unicode "word":
+The `u` flag is used to create "unicode" regular expressions; that is, regular expressions which support matching against unicode text. An important feature that's enabled in unicode mode is [Unicode property escapes](/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Unicode_character_class_escape). For example, the following regular expression might be used to match against an arbitrary unicode "word":
 
 ```js
 /\p{L}*/u;
 ```
 
-There are a number of other differences between unicode and non-unicode regular expressions that one should be aware of:
-
-- Unicode regular expressions do not support so-called "identity escapes"; that is, patterns where an escaping backslash is not needed and effectively ignored. For example, `/\a/` is a valid regular expression matching the letter 'a', but `/\a/u` is not.
-- Curly brackets need to be escaped when not used as [quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers). For example, `/{/` is a valid regular expression matching the curly bracket '{', but `/{/u` is not — instead, the bracket should be escaped and `/\\{/u` should be used instead.
-- The `-` character is interpreted differently within character classes. In particular, for Unicode regular expressions, `-` is interpreted as a literal `-` (and not as part of a range) only if it appears at the start or end of the character class. For example, `/[\w-:]/` is a valid regular expression matching a word character, a `-`, or `:`, but `/[\w-:]/u` is an invalid regular expression, as `\w` to `:` is not a well-defined range of characters.
-
 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.
 
 ## Examples
 
 > **Note:** Several examples are also available in:
 >
 > - The reference pages for {{jsxref("RegExp/exec", "exec()")}}, {{jsxref("RegExp/test", "test()")}}, {{jsxref("String/match", "match()")}}, {{jsxref("String/matchAll", "matchAll()")}}, {{jsxref("String/search", "search()")}}, {{jsxref("String/replace", "replace()")}}, {{jsxref("String/split", "split()")}}
-> - The guide articles: [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes), [assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions), [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences), [quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers), [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
+> - The guide articles: [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes), [assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions), [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences), [quantifiers](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Quantifiers)
 
 ### Using special characters to verify input
 

files/en-us/web/javascript/guide/regular_expressions/quantifiers/index.md

@@ -12,7 +12,7 @@ Quantifiers indicate numbers of characters or expressions to match.
 
 ## Types
 
-> **Note:** In the following, _item_ refers not only to singular characters, but also includes [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes), [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes), [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences).
+> **Note:** In the following, _item_ refers not only to singular characters, but also includes [character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes) and [groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences).
 
 <table class="standard-table">
   <thead>
@@ -206,7 +206,6 @@ console.log(text.match(nonGreedyRegexp));
 
   - [Character classes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes)
   - [Assertions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Assertions)
-  - [Unicode property escapes](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Unicode_property_escapes)
   - [Groups and backreferences](/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences)
 
 - [The `RegExp()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)