Sort common Regular Expressions in PHP

----------------------------------------------------------- Regular Expression collection

Mobile phone number:
$ Mode = "/^ 1 [358] \ d {9 }/";

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

------------------------------------------------------------ Regular Expression Basics

$ Mode = "/^ 1 [358] \ d {9}/I ";
The matching module must start and end with //. The second module can be followed by a pattern modifier.

Atom
① A-z A-Z _ 0-9 // The most common character
② (Abc) // The unit symbol enclosed in parentheses
③ [Abcs] [^ abd] // an atomic table enclosed in square brackets,
^ In the atomic table indicates exclusion or inverse content.

\ D contains all numbers [0-9]
\ D except all numbers [^ 0-9]
\ W contains all English characters [a-zA-Z_0-9]
\ W except all English characters [^ a-zA-Z_0-9]
\ S contains blank areas such as carriage return, line feed, and paging [\ f \ n \ r]

Metacharacters
* Match the previous content 0 times 1 time or multiple times
+ 1 or multiple times
? 0 or 1 time
. Represents any character (except for carriage return)
| Equivalent to php | ("or)
^ Force match the first part of the string
$ Force match string tail content
[^ Abc] matches content except a, B, or c.
\ B matches the word boundary. The boundary can be a space or a special symbol.
\ B matches the content except the word boundary
{M} matches the previous content with M duplicates.
{M,} matches the repeat of the previous content more than or equal to M
{M, n} matches the number of repetitions of the previous content M to N
() Overall match, and put it into memory, you can use \ 1 or \ 2... Obtain

Priority: Decrease in order
() Parentheses are the highest for memory processing.
*? + {} Duplicate Matching content followed
^ $ \ B boundary processing third
| Condition processing fourth
Finally, matching is calculated in the order of operation.

Common modifier: $ mode = "/regular/U ";
I. The regular content is case-insensitive during matching (the default value is case-sensitive)
M uses multiple lines to identify and match the first or last content
S. Convert the carriage return to a space.
X ignore the blank in the Regular Expression
A force match from scratch
D Force $ NO content at the end of the match \ n
U prohibits greedy matching. It only traces the latest matching character and ends,
Regular expressions commonly used in collection programs

Application
Preg_match_all (string pattern, string subject, array matches [, int flags])
Capture detailed content, collect webpages, and analyze 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 array regular
2. The replacement content can be replaced by the modifier e.
Preg_split (string pattern, string subject [, int limit [, int flags])
Regular expressions are used to cut related content. Similar to the explode cut function
Only one cutting method has 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]