The use of string. Replace () in Javascript

String. Replace ()

Syntax:

 
String. Replace (Regexp, replacement)
 

Regexp: the regular expression of the replacement operation. If a string is input, it is processed as a normal character and only one replacement operation is performed. If it is a regular expression, with the global (g) modifier, all target characters will be replaced. Otherwise, only one replacement operation will be performed.

Replacement: The character you want to replace.

The return value is the string after the replacement operation is executed.

String. Replace ()

 
VaRTEXT = "javascript is very powerful! "; Text. Replace (/JavaScript/I, "JavaScript");//Return: javascript is very powerful!
 

String. Replace () replace all Target Characters

VaRTEXT = "javascript is very powerful! Javascript is my favorite language! "; Text. Replace (/JavaScript/ig, "JavaScript");//Return: javascript is very powerful! Javascript is my favorite language!
 

String. Replace ()

 
VaRName = "doe, John"; Name. Replace (/(\ W +) \ s *, \ s * (\ W +)/, "$2 $1");//Return Value: John Doe
 

String. Replace () is used to replace all characters in double quotation marks with characters in brackets.

VaRTEXT = '"JavaScript" is very powerful! '; Text. Replace (/"([^"] *) "/G," [$1]");//Response: [JavaScript] is very powerful!
 

String. Replace () uppercase letters

VaRTEXT = 'a journey of a thousand miles begins with single step .'; Text. Replace (/\ B \ W + \ B/g,Function(Word ){ReturnWord. substring (0, 1). touppercase () +Word. substring (1);});//Return Value: A journey of a thousand miles begins with single step.
 

From above: http://www.codebit.cn/javascript/javascript-replace.html

String. Replace () parameter description

When the first parameter is a regular expression and the second parameter is a function, $ in the function parameter of the second parameter indicates the regular expression matching string, $1, $2... group Content:

 "ABC {name} test". Replace (/{(.*?)} /IMG,  function  ($, $1 ) {console. log ($, $  1); ///   output {name} name   return  $1 ;});