Regular Expressions |
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| Character | Definition |
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| ^ | Start of a string. |
| $ | End of a string. |
| . | Any character (except \n newline) |
| | | Alternation. |
| {...} | Explicit quantifier notation. |
| [...] | Explicit set of characters to match. |
| (...) | Logical grouping of part of an expression. |
| * | 0 or more of previous expression. |
| + | 1 or more of previous expression. |
| ? | 0 or 1 of previous expression; also forces minimal matching when an expression might match several strings within a search string. |
| \ | Preceding one of the above, it makes it a literal instead of a special character. Preceding a special matching character, see below. |
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| Char Class | Description |
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| . | Matches any character except \n. If modified by the Singleline option, a period character matches any character. For more information, see Regular Expression Options. |
| [aeiou] | Matches any single character included in the specified set of characters. |
| [^aeiou] | Matches any single character not in the specified set of characters. |
| [0-9a-fA-F] | Use of a hyphen (–) allows specification of contiguous character ranges. |
| \p{name} | Matches any character in the named character class specified by {name}. Supported names are Unicode groups and block ranges. For example, Ll, Nd, Z, IsGreek, IsBoxDrawing. |
| \P{name} | Matches text not included in groups and block ranges specified in {name}. |
| \w | Matches any word character. Equivalent to the Unicode character categories
[\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \w is equivalent to [a-zA-Z_0-9]. |
| \W | Matches any nonword character. Equivalent to the Unicode categories [^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \W is equivalent to [^a-zA-Z_0-9]. |
| \s | Matches any white-space character. Equivalent to the Unicode character categories [\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \s is equivalent to [ \f\n\r\t\v]. |
| \S | Matches any non-white-space character. Equivalent to the Unicode character categories [^\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \S is equivalent to [^ \f\n\r\t\v]. |
| \d | Matches any decimal digit. Equivalent to \p{Nd} for Unicode and [0-9] for non-Unicode, ECMAScript behavior. |
| \D | Matches any nondigit. Equivalent to \P{Nd} for Unicode and [^0-9] for non-Unicode, ECMAScript behavior. |
