JS replaces all specified characters (implementation code) in a string _javascript tips

The first time you found the Replace () method in JavaScript is to use the Str.replace ("-", "!") directly. Only the first matching character will be replaced.
and Str.replace (/\-/g, "!") You can replace all the matching characters (G is the global flag).

Replace ()

The Replace () method returns the string so results when you replace text matching its-argument
(a regular expression) with the text of the second argument (a string).
If the G (global) flag is not set in the regular expression declaration, this method replaces only the
Occurrence of the pattern. For example,

var s = "Hello." Regexps are fun. "; s = S.replace (/\./,"! "); Replace the period with a exclamation pointalert (s);

Produces the string "hello! Regexps are fun. " Including the G flag would cause the interpreter to
Perform a global replace, finding and replacing every matching substring. For example,

var s = "Hello." Regexps are fun. "; s = S.replace (/\./g,"! "); Replace all periods with exclamation pointsalert (s);

Yields this result: "hello! Regexps are fun! "

So there are several ways to do this:

String.Replace (/reallydo/g, replacewith);

String.Replace (New RegExp (Reallydo, ' G '), replacewith);

String: An expression containing a substring to override.
Reallydo: the substring being searched.

ReplaceWith: a substring to replace.

JS Code

<script type= "Text/javascript" > 
String.prototype.replaceAll = function (Reallydo, replacewith, IgnoreCase) { 
  if (! RegExp.prototype.isPrototypeOf (Reallydo)) {return 
    this.replace (new RegExp Reallydo, ignoreCase? "GI": "G")), replacewith); 
  } else {return 
    this.replace (Reallydo, replacewith); 
  } 
} 
</script> 

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