regex for alphanumeric and allow an additional character also

How could I allow a string to match alphanumeric characters and a comma cha开发者_JS百科racter And have the input be a minimum of 6 and 50 max;

Now, it matches nothing, with or without the comma in it?

test = "dam, Amsterdam";
if( test.match(/^\w{6,50}\,$/) ){

thanks, Richard

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/^[\w, ]{6,50}$/

I've created a character class (the square brackets) and added comma and space. The regex space is a way to allow the space after the comma in the input. Note that it's never necessary to escape a comma in a regex.