Regular Expressions on Wikipedia
Regex Cheat Sheet
| Pattern | Description |
|---|---|
. | Matches any character except a newline |
^ | Matches the start of a string |
$ | Matches the end of a string |
\d | Matches any digit (0-9) |
\D | Matches any non-digit |
\w | Matches any word character (alphanumeric + underscore) |
\W | Matches any non-word character |
\s | Matches any whitespace character |
\S | Matches any non-whitespace character |
* | Matches 0 or more of the preceding element |
+ | Matches 1 or more of the preceding element |
? | Matches 0 or 1 of the preceding element |
{n} | Matches exactly n occurrences |
{n,} | Matches n or more occurrences |
{n,m} | Matches between n and m occurrences |
[] | Matches any one of the enclosed characters |
[^]OR operator | Matches any character not in the brackets |
() | Capturing group |
(?=...) | Lookahead assertion |
(?<=...) | Lookbehind assertion |
(?!...) | Negative lookahead |
(?<!...) | Negative lookbehind |