Common regular expression finishing in PHP

---------------------------------------------------------Regular Collection

Mobile Number:
$mode = "/^1[358]\d{9}/";

Email Address:
$mode = "/^[a-z][-_\.]? [A-z\d]*@[a-z0-9]+[\.] [A-z] {2,4}/i ";

----------------------------------------------------------Regular Foundation

$mode = "/^1[358]\d{9}/i";
The matching module must be in//start and end, and the second/post can be added to the mode modifier

Atomic
①a-z-A-Z _ 0-9//most common characters
② (ABC)//cell symbol enclosed in parentheses
③[ABCS] [^ABD]//atomic table enclosed in square brackets,
^ in atomic table excluding or opposing content

\d contains all numbers [0-9]
\d except for all numbers [^0-9]
\w contains all English characters [a-za-z_0-9]
\w except for all English characters [^a-za-z_0-9]
\s contains blank areas such as carriage return, line break, paging, etc. [\f\n\r]

Metacharacters
* 0 times 1 or more occurrences of the previous content
+ 1 or more times
？ 0 times or 1 times
. Represents any one character (except carriage return line wrap)
Quite with the meaning of PHP ("or")
^ Force Match string Header content
$ force Match string tail content
[^ABC] matches content other than a or B or C
\b Match word boundaries, boundaries can be spaces or special symbols
\b Matches anything other than a word boundary
{m} matches the previous content with a repeat number of M times
{m,} repeat times greater than or m times to match previous content
{M,n} matches the repeat number of the previous content m times to N times
() overall match, and put into memory, you can use \\1 or \\2 ... Sequentially get

Priority: decreasing in descending order
() parentheses are highest because they are memory processed
* ？ + {} Repeat match content second
^ $ \b Border Processing third
Conditional Treatment IV
Finally, the match is calculated in order of operation

Common modifiers: $mode = "/Regular/U";
I regular content is not case-sensitive when matching (default is distinguished)
M uses multiple line recognition matching when matching first content or tail content
S converts carriage return to space
x ignores whitespace in the regular
A force to start A match from scratch
D force $ match tail without any content \ n
U prohibits greedy matching, only tracks to the nearest match and ends,
Regular expressions commonly used in the acquisition program

Application
Preg_match_all (string pattern, string subject, array matches [, int flags])
Interception of more detailed content, collection of Web pages, analysis of text
Preg_replace (mixed pattern, mixed replacement, mixed subject [, int limit])
Preg_replace (mixed pattern, mixed replacement, mixed subject [, int limit])
Tip 1, the replacement content can be a regular or an array of regular
2, replacement content can be replaced by the modifier e to address the implementation of the content
Preg_split (string pattern, string subject [, int limit [, int flags]])
Through regular expressions to cut related content, similar to the previous learned explode cutting function, but explode
Can only be cut in one way with limitations.
-------------------------------------------------Debug Code
[Code]
<?php
$mode = "/^[a-z][-_\.]? [A-z\d]*@[a-z0-9]+[\.] [A-z] {2,4}/i ";
$str = "A12345@jb51.net";
echo $str. ' if (Preg_match ($mode, $str, $arr)) {
Echo ' Succeed-<font color=red> '. $arr [0];
}else{
Echo ' failed ';
}
?>
[Code]