PHP手册 - 句点

句点

在字符类外部, 模式中的句点匹配目标字符串中的任意字符, 包括非打印字符, 但是(默认)不包括换行符. 如果PCRE_DOTALL 被设置, 句点就会匹配换行符. 句点的处理和^, $的处理没有关联, 它们唯一的关系是它们都涉及到了换行符. 句点在字符类中没有任何意义.

\C可以被用于匹配单字节, 也就是说在UTF-8模式下, 句点可以匹配多字节字符.

PHP手册 - N: 句点

用户评论:

Anonymous (02-Feb-2011 11:46)

Consider, preg_match_all("/<img.*>/", $htmlfile, $match); Since PCRE_DOTALL is not used, this pattern is expected to NOT make matches across multiple lines. However, in somecases it can, depending on the PCRE default settings and your data ($htmlfile). The problem is that some are set to recognize NEWLINES differently. To fix this use, preg_match_all("/(*ANY)<img.*>/", $htmlfile, $match); Now, any character that could possibly be seen as a newline will be interpreted as a newline by the PCRE. NOTE: This pattern has been available since PCRE version 7.3