Alphanumeric Regex Metasymbols
From Augix' Wiki
Table 5.7. Alphanumeric Regex Metasymbols
| Symbol | Atomic | Meaning |
|---|---|---|
| \0 | Yes |
Match the null character (ASCII NUL). |
| \NNN | Yes |
Match the character given in octal, up to \377. |
| \n | Yes |
Match nth previously captured string (decimal). |
| \a | Yes |
Match the alarm character (BEL). |
| \A | No |
True at the beginning of a string. |
| \b | Yes |
Match the backspace character (BS). |
| \b | No |
True at word boundary. |
| \B | No |
True when not at word boundary. |
| \cX | Yes | Match the control character Control-X (\cZ, \c[, etc.). |
| \C | Yes | Match one byte (C char) even in utf8 (dangerous). |
| \d | Yes |
Match any digit character. |
| \D | Yes |
Match any nondigit character. |
| \e | Yes | Match the escape character (ASCII ESC, not backslash). |
| \E | -- |
End case (\L, \U) or metaquote (\Q) translation. |
| \f | Yes |
Match the form feed character (FF). |
| \G | No |
True at end-of-match position of prior m//g. |
| \l | -- |
Lowercase the next character only. |
| \L | -- |
Lowercase till \E. |
| \n | Yes | Match the newline character (usually NL, but CR on Macs). |
| \N{NAME} | Yes |
Match the named char (\N{greek:Sigma}). |
| \p{PROP} | Yes |
Match any character with the named property. |
| \P{PROP} | Yes | Match any character without the named property. |
| \Q | -- |
Quote (de-meta) metacharacters till \E. |
| \r | Yes |
Match the return character (usually CR, but NL on Macs). |
| \s | Yes |
Match any whitespace character. |
| \S | Yes |
Match any nonwhitespace character. |
| \t | Yes |
Match the tab character (HT). |
| \u | -- |
Titlecase next character only. |
| \U | -- |
Uppercase (not titlecase) till \E. |
| \w | Yes |
Match any "word" character (alphanumerics plus "_"). |
| \W | Yes |
Match any nonword character. |
| \x{abcd} | Yes |
Match the character given in hexadecimal. |
| \X | Yes |
Match Unicode "combining character sequence" string. |
| \z | No |
True at end of string only. |
| \Z | No |
True at end of string or before optional newline. |
