Regular expressions of PHP basic knowledge inspection points

1. The role of regular expressions: split, search, match, replace strings

2. Separator: forward slash ( /), hash symbol (#) and negation symbol (~).

3. Universal atoms: \d \D \s \S \w \W

4. Atomic symbols

5. Pattern modifier

6. Back reference

7. Greedy mode

8. Regular expression PCRE functionprge_match() , preg_match_all(), preg_replace(), preg()_split().

Solution Question method method

Write a string to be matched

Use atoms and metacharacters of regular expressions to splice from left to right

Finally Add correction mode

Practice common regular expressions (mobile phone number, ID card, email, url, etc.)

Mobile phones starting with 139 Number

$str = '13988888888';
$partten = '/^139/d{8}$/';
preg_match($partten, str, $match);
var_dump($match);

Get the sr value of all img tags in the html page

$str = &#39;<img id=content"" src="高清无码.jpg" alt="高清无码">&#39;;
$partten = &#39;/<img .*?src="(.*?)".*?\/? alt="Regular expressions of PHP basic knowledge inspection points" >/i&#39;;
preg_match($partten, $str, $match);
var_dump($march);

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