javascript - How to match this regex or null? -

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i have javascript function validates user input shown below:

function validaterugsize(rug_size) {     var regex = /^(\d{1,2})(\')? (\d{1,2})("|\'\')? (x|x)? ?(\d{1,2})(\')? (\d{1,2})("|\'\')?$/;     return regex.test(rug_size); }

which gets called here:

if (!validaterugsize(rug_size[i])) {     $("#sizelabel" + i).text("please enter valid rug size.");     $("#sizelabel" + i).css("color", "red");     $("#size" + i).focus();     return false; } else {     $("#sizelabel" + i).text(""); }

i want user's input valided if user enters value there. don't want require input, however.

how can done?

you need add condition:

if((rug_size[i].length > 0){     if (!validaterugsize(rug_size[i])) {         $("#sizelabel" + i).text("please enter valid rug size.");         $("#sizelabel" + i).css("color", "red");         $("#size" + i).focus();         return false;     } else {         $("#sizelabel" + i).text("");     } }

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