Built-in objects in JavaScript: RegExp objects

I. Definition of REGEXP

The RegExp object is used to store the retrieval mode. The search mode for creating RegExp objects is as follows:

var mypattern=new RegExp (pattern,attributes);

(1) parameter pattern is a string that specifies the pattern of a regular expression or other regular expression

(2) The parameter attributrs is an optional string that contains the attribute "G", "I", "M", respectively, to specify global matching, case-sensitive matching, and multi-line matching.

Second, the method of RegExp

A total of three methods: Test (), exec (), compile ()

1, Test (): Retrieves the value specified in the string, returns True or False

Example

2. EXEC (): Retrieves the value specified in the string, but returns the value found

Example

3, compile (): Used to change the RegExp retrieval mode

var patt1=new RegExp ("E");d Ocument.write (Patt1.test ("The Best things on life is Free");p att1.compile ("D"); document.write (Patt1.test ("The best things in life is free");

Built-in objects in JavaScript: RegExp objects