JavaScript RegExp Reference
New to JavaScript RegExp?
Complete RexExp Reference
Revised July 2025
| Name | Description |
|---|---|
| compile() | Compiles a regular expression (Deprecated) |
| constructor | Returns the function that created the RegExp prototype |
| dotAll | Returns true if the s flag is set in the expression(new in 2018) |
| escape() | Returns a string where characters that belongs to the regular expression syntax are escaped (new in 2025) |
| exec() | Returns a result array for a matches in a string |
| flags | Returns the modifiers set in the expression (new in 2015) |
| global | Returns true if the g flag is set in the expression |
| hasIndices | Returns true if the d flag is set (new in 2022) |
| ignoreCase | Returns true if the i flag is set |
| lastIndex | Specifies the index at which to start the next match |
| multiline | Returns true if the m modifier is set |
| source | Returns the text of the RegExp pattern |
| sticky | Returns true if the y flag is set(new in 2015) |
| test() | Tests for a match in a string. Returns true or false |
| toString() | Returns the string value of the regular expression |
| unicode | Returns true if the u flag is set(new in 2018) |
| unicodeSets | Returns true if the v flag is set(new in 2023) |
RegExp String Methods
| Method | Description |
|---|---|
| match(regexp) | Returns an Array of results |
| matchAll(regexp) | Returns an Iterator of results |
| replace(regexp, s) | Returns a new String |
| replaceAll(regexp, s) | Returns a new String |
| search(regexp) | Returns the index of the first match |
| split(regexp) | Returns an Array of results |
Browser Support
/regexp/ is an ECMAScript1 (JavaScript 1997) feature.
It is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera |
