Supported Metacharacters
Apache supports the metacharacters and metasequences listed in Table 48 through Table 52. For expanded definitions of each metacharacter, see "Regex Metacharacters, Modes, and Constructs.”
Table 1-48. Apache character representations
Sequence | Meaning |
|---|---|
| Character specified by a three-digit octal code. |
| Character specified by a one- or two-digit hexadecimal code. |
| Character specified by any hexadecimal code. |
| Named control character. |
Table 1-49. Apache character classes and class-like constructs
Class | Meaning |
|---|---|
| A single character listed, or contained within a listed range. |
| A single character not listed, and not contained within a listed range. |
| POSIX-style character class (valid only within a regex character class). |
| Any character, except newline (unless single-line mode, |
| One byte; however, this may corrupt a Unicode character stream. |
| Word character, |
| Nonword character, |
| Digit character, |
| Nondigit character, |
| Whitespace character, |
| Nonwhitespace character, |
Table 1-50. Apache anchors and zero-width tests
Sequence | Meaning |
|---|---|
| Start of string. |
| End of search string. |
| Word boundary; position between a word character ( |
| Not-word-boundary. |
| Positive lookahead. |
| Negative lookahead. |
| Positive lookbehind. |
| Negative lookbehind. |
Table 1-51. Apache comments and mode modifiers ...