Regexp to pull input tags out of form

 

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  • RegEx match open tags except XHTML self-contained tags 35 answers

    • Regexes are fundamentally bad at parsing HTML (see Can you provide some examples of why it is hard to parse XML and HTML with a regex? for why). What you need is an HTML parser. See Can you provide an example of parsing HTML with your favorite parser? for examples using a variety of parsers.

    Why can't you just use the DOM? 

    var inputFields = document.getElementById('form_id').getElementsByTagName('input');
for (var i = 0, l = inputFields.length; i < l; i++) {
    // Do something with inputFields[i] ...
}

    If you must use regex: 

    var formHTML = document.getElementById('form_id').innerHTML;
var inputs = formHTML.match(/<input.+?/?>/g);

    Note, the above regular expression is not reliable and will not work in ALL situations, hence why you should use the DOM! :)

    You can use document.createElement to create some element and then (ab)use it's innerHTML property to create a DOM from a string: 

    var html = document.createElement("div");
html.innerHTML = "<form><input/><input/><input/></form>";

// now you can use dom methods, e.g. getElementsByTagName
var inputs = html.getElementsByTagName("input");
var foo = inputs[0].value; // ...

    You might have to manually remove your <html> tags beforehand though as IE has trouble parsing full documents (if I remember correctly).

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