Dynamic Web pages make PHP regular expressions commonly used

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)

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

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

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

Application: JavaScript does not have a trim function like VBScript, we can use this expression to implement, as follows:

To decompose and transform an IP address using a regular expression:

The following is a JavaScript program that uses a regular expression to match an IP address and converts an IP address to a corresponding numeric value:

However, if the above program does not use a regular expression, and the split function directly to decompose may be simpler, the program is as follows:

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