I have this string:
"dsfnsdfksh[aa]lkdfjldfjgljd[aa]"
I need to find all occurrencies of [aa] and replace it by another string, for example: dd
How can I do that?
- What have you already tried?PM 77-1– PM 77-12015-04-24 01:14:27 +00:00Commented Apr 24, 2015 at 1:14
- possible duplicate of Replacing all occurrences of a string in JavaScriptpenner– penner2015-04-24 01:20:16 +00:00Commented Apr 24, 2015 at 1:20
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3 Answers
You can use a regex with the g flag. Note that you will have to escape the [ and ] with \
//somewhere at the top of the script if (!RegExp.escape) { RegExp.escape = function(value) { return value.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&") }; } var string = "dsfnsdfksh[aa]lkdfjldfjgljd[aa]"; var pattern = '[aa]'; var regex = new RegExp(RegExp.escape(pattern), 'g'); var text = string.replace(regex, 'dd'); console.log(text)3 Comments
cmonti
this is working but If I need to replace the pattern with a variable is not working for example var pattern = '/[' + 'aa' + ']/g' doesn't work
S McCrohan
The pattern (ETA: that WAS) being passed into
replace() in the answer above is not a string - if you look close, you'll see there are no quotes around it. However, the docs for replace() do offer a form that will take a string. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
Arun P Johny
@SMcCrohan you can create a dynamic regex, using the constructor as updated above
You can use .replace for this. Here is an example:
HTML
<!DOCTYPE Html /> <html> <head> <title></title> </head> <body> <input type="text" id="theInput" /> <input type="submit" value="replace" id="btnReplace"/> <script type="text/javascript" src="theJS.js"></script> </body> </html> JavaScript
var fieldInput = document.getElementById("theInput"); var theButton = document.getElementById("btnReplace"); theButton.onclick = function () { var originalValue = fieldInput.value; var resultValue = originalValue.replace(/\[aa\]/g, "REPLACEMENT"); fieldInput.value = resultValue; } 
Comments
With this I can replace all occurrencies:
var pattern = '[aa]'; var string = "dsfnsdfksh[aa]lkdfjldfjgljd[aa]"; var text = string.replace(new RegExp(pattern.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'g'), 'dd'); console.log(text);