Tips for using the character replacement function String. replace () in js

String. replace ()
Syntax:
Var strings = 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.

11 String. replace () simple usage
Var text = "javascript is very powerful! "; 13 text. replace (/javascript/I," JavaScript "); 14 // return: JavaScript is very powerful!

String. replace () replace all Target Characters
Var text = "javascript is very powerful! JAVASCRIPT is my favorite language! "; 17 text. replace (/javascript/ig," JavaScript "); 18 // return: JavaScript is very powerful! JavaScript is my favorite language!

String. replace ()

Var name = "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.
Var text = '"JavaScript" is very powerful! '; 25 text. replace (/"([^"] *) "/g," [$1] "); 26 // return: [JavaScript] Very powerful!

String. replace () uppercase letters
Var text = 'a journey of a thousand miles begins with single step. '; 29 text. replace (/\ B \ w + \ B/g, function (word) {30 return word. substring (0, 1 ). toUpperCase () + 31 word. substring (1); 32}); 33 34 // return: A Journey Of A Thousand Miles Begins With Single Step.