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regexp functions ,
include functions ,
variable functions ,
post functions
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Since PHP 4.4.0 and 5.1.0, three additional escape sequences to match generic character types are available when UTF-8 mode is selected. They are:
The property names represented by xx above are limited to the Unicode general category properties. Each character has exactly one such property, specified by a two-letter abbreviation. For compatibility with Perl, negation can be specified by including a circumflex between the opening brace and the property name. For example, \p{^Lu} is the same as \P{Lu}.
If only one letter is specified with \p or \P, it includes all the properties that start with that letter. In this case, in the absence of negation, the curly brackets in the escape sequence are optional; these two examples have the same effect:
\p{L}
\pL
| C | Other |
| Cc | Control |
| Cf | Format |
| Cn | Unassigned |
| Co | Private use |
| Cs | Surrogate |
| L | Letter |
| Ll | Lower case letter |
| Lm | Modifier letter |
| Lo | Other letter |
| Lt | Title case letter |
| Lu | Upper case letter |
| M | Mark |
| Mc | Spacing mark |
| Me | Enclosing mark |
| Mn | Non-spacing mark |
| N | Number |
| Nd | Decimal number |
| Nl | Letter number |
| No | Other number |
| P | Punctuation |
| Pc | Connector punctuation |
| Pd | Dash punctuation |
| Pe | Close punctuation |
| Pf | Final punctuation |
| Pi | Initial punctuation |
| Po | Other punctuation |
| Ps | Open punctuation |
| S | Symbol |
| Sc | Currency symbol |
| Sk | Modifier symbol |
| Sm | Mathematical symbol |
| So | Other symbol |
| Z | Separator |
| Zl | Line separator |
| Zp | Paragraph separator |
| Zs | Space separator |
Extended properties such as "Greek" or "InMusicalSymbols" are not supported by PCRE.
Specifying case-insensitive (caseless) matching does not affect these escape sequences. For example, \p{Lu} always matches only upper case letters.
The \X escape matches any number of Unicode characters that form an extended Unicode sequence. \X is equivalent to (?>\PM\pM*).
That is, it matches a character without the "mark" property, followed by zero or more characters with the "mark" property, and treats the sequence as an atomic group (see below). Characters with the "mark" property are typically accents that affect the preceding character.
Matching characters by Unicode property is not fast, because PCRE has to search a structure that contains data for over fifteen thousand characters. That is why the traditional escape sequences such as \d and \w do not use Unicode properties in PCRE.
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