Question

Given the following string: ‘s0\\8\\26\\29\\30\\32’ or ‘s0\\8\\26\\’ or ‘s0\\5’, I need to return the last digits of the string.

Given:

 function getFolderID(mystr) {
        var reFolderID = /\bs0\\\\[0-9]+\b/g //regexp to return s0\\34
        var retArr = [];
        var retval = '';

        retArr = mystr.match(reFolderID);
        retArr = retArr[0].replace(/s0\\\\/g, "");

        if (retArr != null) {
            retval = retArr[retArr.length - 1];
        }
        //alert("Ret: " + retval);
        return retval;
    }  

At first I thought I just needed the first digits, but turns out I need the last ones.

What would the proper regexp term be for this?

Also, how can I create an ASP.Net event handler to do something with the returned JS value?

Answer 1

You might try the following. It should following the formatting and group the last set of numbers.

/s0\\\\(?:[0-9]+\\\\)*([0-9]+)/

So, something like:

function getFolderID(mystr) {
    // search string for last group of digits in the pattern
    var matches = mystr.match(/s0\\\\(?:[0-9]+\\\\)*([0-9]+)/);

    // if matches is null, replace with "defaults"
    matches ||= ["", ""];

    // grab the first grouped match
    return matches[1];
}

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As for the ASP.NET event, you’ll probably have to use Ajax — such as by <asp:UpdatePanel /> or your choice of Ajax library (jQuery, Prototype, etc.).

Without Ajax, JavaScript and ASP.NET will never execute at the same time.