Fuzzy Regex match

fuzzyregex.js

// This will allow unordered search terms to match relevant string
// e.g. Really Long String will be matched by
// - long string
// - long really
// - all ring
// ..etc

// I have used this anonymous function to override the matcher function in select2 

function(term, text) {
    // Build Regex String 
    var matchTerm = '.*';

    // Split all the search terms
    var terms = term.split(" ");

    for(var i = 0; i < terms.length; i++) {
        matchTerm += '(?=.*' + terms[i] + '.*)';
    };

    matchTerm += '.*';

    // Convert to Regex
    // => /.*(?=.*TERM1.*)(?=.*TERM2.*).*/
    var matchRegex = new RegExp(matchTerm.toUpperCase());
 
    return text.toUpperCase().match(matchRegex);
}

Fyi I had to sanitize the term first or you can get an invalid regex.

term = term.replace(/\W/g, ''); // strip non alpha numeric

@gregpardo if you still want to include non alpha numeric chars and not break it do this

term.replace(/(\W)/g, '\\$1')