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The regular method in javascript: 1, exec (), used to retrieve the matching of regular expressions in a string; 2, test (), used to detect whether a string matches the specified regular expression; 3, toString (); 4, replace (); 5, match (); 6, search ().

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

What is regularity?

A regular expression is an object that describes a character pattern.

Regular expressions are used for string pattern matching and retrieval substitution, and are a powerful tool for performing pattern matching on strings.

RegExp object method

Method describes that compile is obsolete in version 1.5. Compile regular expressions. Exec retrieves the value specified in the string. Returns the value found and determines its location. Test retrieves the value specified in the string. Returns true or false. ToString returns a string of regular expressions.

Methods of String objects that support regular expressions

Method describes how FFIEsearch retrieves a value that matches a regular expression. 14match found a match for one or more regular expressions. 14replace replaces the substring that matches the regular expression. 14split splits a string into an array of strings. fourteen

JavaScript exec () method

The exec () method is used to retrieve the match of a regular expression in a string.

Returns null if there is a matching value in the string.

Var str= "Hello world!"; / find "Hello" var patt=/Hello/g;var result=patt.exec (str); [xss_clean] ("return value:" + result); / / find "php" patt=/php/g;result=patt.exec (str); [xss_clean] ("

Return value: "+ result)

JavaScript test () method

The test () method is used to detect whether a string matches a pattern.

Returns true if there is a matching value in the string, false otherwise.

Var str= "Hello world!"; / find "Hello" var patt=/Hello/g;var result=patt.test (str); [xss_clean] ("return value:" + result); / / find "php" patt=/php/g;result=patt.test (str); [xss_clean] ("

Return value: "+ result)

JavaScript RegExp toString () method

The toString () method returns the string value of the regular expression.

Click the button to return the string value of the regular expression.

Click function myFunction () {var str=document.getElementById ("demo") [xss_clean]; var n=str.replace (/ blue/gi, "red"); document.getElementById ("demo") [xss_clean] = n;}

JavaScript match () method

The match () method retrieves the specified value within a string or finds a match of one or more regular expressions.

Click the button to display matches

Click function myFunction () {var str= "Mr. Blue has a blue house" var n=str.search ("blue"); document.getElementById ("demo") [xss_clean] = n;}

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