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Pattern match:

\: escape characters such as:\ b escaped b

^: regular expression start symbol

$: regular expression end symbol

*: match the preceding character 0 or n times

+: matches the preceding character once or n times

?: match the preceding character 0 or 1 times

Matches all single characters except newline characters

| |: or, for example, x | y matches x or y |

{n}: matches the first n characters

{nrecoery m}: match at least n and up to m preceding characters

[xyz]: matches any character in parentheses

[^ xyz]: matching is equivalent to [0-9] except for any character in square brackets

\ w: matching any number or letter or underscore is equivalent to [A-Za-z0-9 _]

\ d: matches any number between 0Murray 9

Pattern modifier:

I: ignore case

Examples of common regular expressions:

/ / the user name consists of 6-18 alphanumeric underscores and cannot start with a number.

Var r_name=/ ^ [a-z]\ w {5pm 17} $/ I

/ / the password length cannot be less than six digits.

Var r_pwd=/ ^\ w {6,} $/

/ / all general email addresses

Var r_eamil=/ ^\ walled @\ w+ (\.)\ wrought /

/ / match an address of QQ Mail

/ / 861745122@qq.com

Var r_qq_email=/ ^\ d {5,} @ qq (\.) com$/

/ / match an email address of 163

Var r_163_email=/ ^\ way.163 (\.) com$/

/ / match a suffix name that may be .com | .net | .cn | .edu

Var email=/ ^\ walled @\ w+ (\.) com | net | cn | edu$/

/ / A valid age group is required

Var r_age=/ ^\ d {1pc2} $/

/ / if (age > = 18&&age "= 100)

/ / verify the mobile phone number: 11 digits at the beginning of 13 15 18

Var r_tel=/ ^ 1 [3pr 5pr 8]\ d {9} $/

/ / verify the ID number of 18 digits or 17 digits plus an X

Var r_s=/ ^\ d {18} |\ d {17} xgarbage I

/ / verify Chinese var reg=/ ^ [\ u4e00 -\ u9fa5] {2pr 17} $/

/ / php

$reg = "/ ^ [\ x {4e00} -\ x {9fa5}] $/ u"

The following is an example: account basic information login account: gender: male and female account security settings login password: real name: email address:

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