javascript regex pattern with a variable string not working

Question

I am trying to create a function that will pass some parameters to a regex script:

function classAttributes( classString, className ) {
    var data;
    var regex = new RegExp(className+"\[(.*?)\]");
    var matches = classString.match(regex);

    if ( matches ) {
        //matches[1] refers to options inside [] "required, email, ..."
            var spec = matches[1].split(/,\s*/);

            if ( spec.length > 0 ) {
                data = spec;
            }
    }

    return data;
}

but for some reason it doesnt like the string variable that I pass it "new RegExp(className+"[(.*?)]");" it doesnt throw an error but the validation doesnt work.

Edit: I will take the information from the class stribute and pass it as classString

<div class="field-character-count test[asd, 123, hello]"></div>

and the "className" will represent "test"

what exactly do classString and className contain?

Leon
– Leon

2011-11-30 15:07:31 +00:00
Commented Nov 30, 2011 at 15:07 — Leon
– Leon, Commented Nov 30, 2011 at 15:07

ipr101 · Accepted Answer · 2011-11-30 15:08:09Z

4

I think you need to escape the backslashes inside the search string -

var regex = new RegExp(className+"\\[(.*?)\\]");

answered Nov 30, 2011 at 15:08

ipr101

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