JavaScript uses regular expressions to replace content in strings _javascript tips

Don't say much, please see the specific implementation code

There ' is ' in the string ' is ': ' The Var str= ' is ' is '
 ;
 var substr=new RegExp (' is ');//Create Regular Expression object
 var result=str.replace (subStr, "");//replace ' is ' with an empty string
 console.log ( result);//is th all there
 are var substr=new RegExp (' is ', ' I ');//create regular Expression objects, case-insensitive
 var result=str.replace (subStr , "");//replace ' is ' with an empty string
 console.log (result);//this all there
 are var substr=new RegExp (' is ', ' IG ');//create regular Expression object. Case-insensitive, global lookup
 var result=str.replace (subStr, "");//replace ' is ' with empty string
 console.log (result);//th all there 
 var substr=/is/ig;//Direct method to create regular expression objects, case-insensitive, global lookup
 var result=str.replace (subStr, "");//replace ' is ' with an empty string
 Console.log (result);//th all there 
 console.log (str);//is The all there is visible replace does not change original STR

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