\a | Alert | ✓ | ✓ | ✓ | | ✓ |
\b | Backspace | ✓ | ✓ | ✓ | ✓ | ✓ |
\n | Newline | ✓ | ✓ | ✓ | ✓ | ✓ |
\r | Carriage return | ✓ | ✓ | ✓ | ✓ | ✓ |
\f | Form feed | ✓ | ✓ | ✓ | ✓ | ✓ |
\t | Horizontal tab | ✓ | ✓ | ✓ | ✓ | ✓ |
\octal | Character specified by a three-digit octal code | ✓ | ✓ | ✓ | | |
[…] | Range or character class | ✓ | ✓ | ✓ | ✓ | ✓ |
[^…] | Not in range or negated character class | ✓ | ✓ | ✓ | ✓ | ✓ |
. | (dot or point) Any character except newline | ✓ | ✓ | ✓ | ✓ | ✓ |
\w | Word character [a-zA-Z0-9_] | ✓ | ✓ | ✓ | ✓ | ✓ |
\W | Nonword character [^a-zA-Z0-9_] | ✓ | ✓ | ✓ | ✓ | ✓ |
\d | Digit character [0-9] | ✓ | ✓ | ✓ | ✓ | ✓ |
\D | Nondigit character [^0-9] | ✓ | ✓ | ✓ | ✓ | ✓ |
\s | Whitespace character [\n\r\f\t] | ✓ | ✓ | ✓ | ✓ | ✓ |
\S | Nonwhitespace character [^\n\r\f\t] | ✓ | ✓ | ✓ | ✓ | ✓ |
^ | (caret) The start of the line of text | ✓ | ✓ | ✓ | ✓ | ✓ |
\A | Start of search string, in all match modes | ✓ | ✓ | ✓ | | ✓ |
$ | (dollar) The end of the line of text | ✓ | ✓ | ✓ | ✓ | ✓ |
\Z | End of string, or the point before a string-ending newline, in any match mode | ✓ | ✓ | ✓ | | ✓ |
\b | Word boundary | ✓ | ✓ | ✓ | ✓ | ✓ |
\B | Not-word-boundary | ✓ | ✓ | ✓ | ✓ | ✓ |
(?=…) | Positive lookahead | ✓ | ✓ | ✓ | ✓ | ✓ |
(?!…) | Negative lookahead | ✓ | ✓ | ✓ | ✓ | ✓ |
(?<=…) | Positive lookbehind | ✓ | ✓ | ✓ | | ✓ |
(?<!…) | Negative lookbehind | ✓ | ✓ | ✓ | | ✓ |
i | Case-insensitive matching | ✓ | ✓ | ✓ | ✓ | ✓ |
m | ^ and $ match next to embedded \n | ✓ | ✓ | ✓ | ✓ | ✓ |
s | Dot (.) matches newline | ✓ | ✓ | ✓ | | |
x | Ignore whitespace, and allow comments (#) in pattern | ✓ | ✓ | ✓ | | ✓ |
(?mode) | Turn list modes on for the rest of the subexpression | ✓ | ✓ | ✓ | | |
(?#…) | Treat substring as a comment | ✓ | ✓ | ✓ | | ✓ |
#… | Rest of the line is treated as a comment in x mode | ✓ | ✓ | ✓ | | ✓ |
(…) | Group subpattern and capture submatch into \1, \2, .. | ✓ | ✓ | ✓ | ✓ | ✓ |
\n | Contains the result of nth earlier submatch from a parentheses capture group, or a named capture group | ✓ | ✓ | ✓ | ✓ | ✓ |
(?:…) | Groups subpattern, but does not capture submatch | ✓ | ✓ | ✓ | ✓ | ✓ |
…|… | Try subpatterns in alternation | ✓ | ✓ | ✓ | ✓ | ✓ |
* | (asterisk or star) Match 0 or more times | ✓ | ✓ | ✓ | ✓ | ✓ |
+ | (plus) Match 1 or more times | ✓ | ✓ | ✓ | ✓ | ✓ |
? | (question mark) Match 1 or 0 times | ✓ | ✓ | ✓ | ✓ | ✓ |
{n} | Match exactly n times | ✓ | ✓ | ✓ | ✓ | ✓ |
{n,} | Match at least n times | | ✓ | ✓ | ✓ | ✓ |
{x,y} | Match at least x times, but no more than y times | ✓ | ✓ | ✓ | ✓ | ✓ |
*? | Match 0 or more times, but a few times as possible | ✓ | ✓ | ✓ | ✓ | ✓ |
+? | Match 1 or more times, but a few times as possible | ✓ | ✓ | ✓ | ✓ | ✓ |
?? | Match 0 or 1 times, but as few times as possible | ✓ | ✓ | ✓ | ✓ | ✓ |
{x,y}? | Match at least x times, no more than y times, and as few times as possible | ✓ | ✓ | ✓ | ✓ | ✓ |