Regular Expressions in JS

What is a regular expression

A rule of high-level processing of characters when regular expressions

Regular expressions are made up of special metacharacters such as A-Z.

What can regular expressions do?

Find Search () syntax: Str.search (write regular) returns the corresponding subscript of the word typeface, no return 1 (similar to the IndexOf method in the string)

Match test () syntax: Regular. Test (String) returns a Boolean value that is true if the match succeeds

replacing replace () syntax, parameter 1: element parameter two: new element, this method does not change the original string

Get the Match () syntax: Str.match (Regular), if there is no G (following the introduction) case, the return value is a pseudo-array, plus g, is purely a group

Common meta characters

Regular Expressions in JS