1.正则表达式的作用:分割,查找,匹配,替换 字符串
2.分隔符:正斜线(/),hash符(#)以及取反符号(~)。
3.通用原子:d D s S w W
4.原子符
5. 模式修正符
6.后向引用
7.贪婪模式
8.正则表达式PCRE函数 prge_match()
, preg_match_all()
, preg_replace()
, preg()_split()
.
解题方法方法
写出一个要匹配的字符串
自左向右的顺序使用正则表达式的原子和元字符进行拼接
最终加入修正模式
练习常见的正则表达式(手机号码,身份证,email,url等等)
139开头的手机号码
$str = '13988888888';$partten = '/^139/d{8}$/';preg_match($partten, str, $match);var_dump($match);
取出 html页面中所有img标签的sr 的值
$str = '<img id=content"" src="高清无码.jpg" alt="高清无码">';$partten = '/<img.*?src="(.*?)".*?/?>/i';preg_match($partten, $str, $match);var_dump($march);
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