i have this string "Gem. Buitentemperatuur (etmaal)"
And i would like to replace all whitespaces, capitals and special chars so that i end up with
"gem_buitentemperatuur_etmaal" 
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5 Answers
Try this
var yourStr = "Gem. Buitentemperatuur (etmaal)"; var newStr = yourStr.replace(/\s+/g, "_").replace(/\W+/g, "").toLowerCase(); //gem_buitentemperatuur_etmaal .replace() is used to manipulate your string, a simple regular expression is passed to this and the value you want to replace it with
First we replace the Whitespace.
/ <- start the regex \s <- match whitespace character + <- matches one or more times / <- end the regex. And we replace this with your underscore .replace(/\s+/g, "_")
then find and match all non word characters.
/ <- start the regex \W <- match all non word characters (everything but a-z, A-Z, 0-9 and _) + <- matches one or more times / <- end the regex This part looks like this .replace(/\W+/g, "")
the g after the closing / stands for global to look all along the string and not just for the first match.
Here's a fiddle
Comments
"Gem. Buitentemperatuur (etmaal)".toLowerCase().replace(/[^a-z]+(?!$)/g, "_").replace(/^[^a-z]|[^a-z]$/, ""); 
Comments
try this
function escapeRegExp(str) { return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&"); } function replaceAll(find, replace, str) { return str.replace(new RegExp(escapeRegExp(find), 'g'), replace); } 
Comments
You can use:
s="Gem. Buitentemperatuur (etmaal)"; s.toLowerCase().replace(/ +/g, '_').replace(/\W+/g, ''); //=> "gem_buitentemperatuur_etmaal" 
Comments
Use this:
[^\w]+ And .replace() with _.
Working example: http://regex101.com/r/nN9pX7
var str = "Gem. Buitentemperatuur (etmaal)"; str.replace(/\W+/g, "_").toLowerCase().replace(/(^_|_$)/, ""); 