PHP regular function Preg_replace () parameter description _ Regular expression

Preg_replace
String pairs are parsed and replaced.
Grammar: Mixed preg_replace (mixed pattern, mixed replacement, mixed subject);
Return value: Mixed type data
Function type: Data processing
Content Description
This function resolves the string subject by the rules of pattern, replacement the string to be replaced by the parameter. The return value is mixed type data, which is the substituted string result.
Usage examples
The following example returns a value of $startDate = 6/19/1969

Copy Code code as follows:

<?php
$patterns = Array ("/(19|20\d{2})-(\d{1,2})-(\d{1,2})/", "/^\s*{(\w+)}\s*=/");
$replace = Array ("\\3/\\4/\\1", "$\\1 =");
Print Preg_replace ($patterns, $replace, "{startdate} = 1969-6-19");
?>