Complete reference for all pattern syntax.
| Character | Description |
|---|
. | Any character except newline |
^ | Start of string |
$ | End of string |
| ` | ` |
\ | Escape |
(, ) | Groups |
[, ] | Character class |
{, } | Quantifier or fuzziness |
| Syntax | Description |
|---|
[abc] | a, b, or c |
[^abc] | Not a, b, or c |
[a-z] | a to z |
[A-Za-z] | ASCII letters |
[0-9] | Digits |
\d | Digit |
\D | Non-digit |
\w | Word character |
\W | Non-word |
\s | Whitespace |
\S | Non-whitespace |
| Syntax | Description |
|---|
* | 0 or more |
+ | 1 or more |
? | 0 or 1 |
{n} | Exactly n |
{n,} | n or more |
{n,m} | n to m |
*? | Lazy * |
+? | Lazy + |
?? | Lazy ? |
| Syntax | Description |
|---|
{e<=N} | Max N edits |
{i<=N} | Max N insertions |
{d<=N} | Max N deletions |
{s<=N} | Max N substitutions |
{t<=N} | Max N transpositions |
{c<=N} | Max total cost N |
{Ni+Md...<=N} | Weighted costs |
{e<=N:[class]} | Restricted edits |
~N | Shorthand for {e<=N} |
| Syntax | Description |
|---|
(...) | Capture group |
(?:...) | Non-capture |
(?<name>...) | Named capture |
(?=...) | Lookahead |
(?!...) | Negative lookahead |
(?<=...) | Lookbehind |
(?<!...) | Negative lookbehind |
(?>...) | Atomic group |
| Syntax | Description |
|---|
(?i) | Case insensitive |
(?m) | Multi-line |
(?s) | Dot-all |
(?x) | Verbose |
(?U) | Ungreedy |
(?b) | Best match |
(?e) | Enhance match |
(?p) | POSIX mode |