php教程

Character classes

Character classes
SequenceDescription
[...]A single character listed or contained within a listed range. Ranges can be combined with the {+} and {-} operators. For example [a-z]{+}[0-9] is the same as [0-9a-z] and [a-z]{-}[aeiou] is the same as [b-df-hj-np-tv-z].
[^...]A single character not listed and not contained within a listed range.
.Any character, default [^\n].
\dDigit character, [0-9].
\DNon-digit character, [^0-9].
\sWhite space character, [ \t\n\r\f\v].
\SNon-white space character, [^ \t\n\r\f\v].
\wWord caracter, [a-zA-Z0-9_].
\WNon-word caracter, [^a-zA-Z0-9_].

User Contributed Notes

There are no user contributed notes for this page.

CopyRight © 2008-2022 verySource.Com All Rights reserved. 京ICP备17048824号-1 京公网安备:11010502034788