1. The role of regular expressions: Split, search, match, replace String
2. Separator: forward slash (/), hash character (#) and Negate the symbol (~).
3. Universal atoms: \d \D \s \S \w \W
prge_match(), preg_match_all(), preg_replace(), preg()_split().
Solution method Write a requirement Matched string Use regular expression atoms and metacharacters to splice from left to rightFinally add correction pattern Practice common regular expressions ( Mobile phone number, ID card, email, url, etc.) Mobile phone number starting with 139##
$str = '13988888888';
$partten = '/^139/d{8}$/';
preg_match($partten, str, $match);
var_dump($match);$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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