A few more useful regular expressions

Matching regular expressions for Chinese characters: [\U4E00-\U9FA5]

Match Double-byte characters (including Chinese characters): [^\x00-\xff]

Application: Computes the length of the string (a double-byte character length meter 2,ascii character 1)

String.prototype.len=function () {return This.replace ([^\x00-\xff]/g, "AA"). Length;}

A regular expression that matches a blank row: \n[\s|] *\r

Regular expression matching HTML tags:/< (. *) >.*<\/\1>|< (. *) \/>/

Matching a regular expression with a trailing space: (^\s*) | (\s*$)

verifying jpg and gif pictures: ^. {1,}\. ((j| J) (p| P) (g| G) | (g| G) (i| I) (f| F)) $

Verify IP Address:

^ (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [1-9]) \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [1-9]|0) \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [1-9]|0) \. (25[0-5]|2[0-4][0-9]| [0-1] {1} [0-9] {2}| [1-9] {1} [0-9] {1}| [0-9]) $