Javascript function that mimics basic GNU/Linux grep command

miniGrep.js

/** Function that mimics basic GNU/Linux grep command;
 * @param  {String} multiLineString      The multiline string
 * @param  {String} patternToSearch      The RegEx pattern to search for
 * @return {Array}                       An Array containing all the matching row(s) for patternToSearch in multiLineString
 */
function miniGrep(string, patternToSearch) {
    var regexPatternToSearch = new RegExp("^.*(" + patternToSearch + ").*$", "mg");
    match = string.match(regexPatternToSearch);
    return match;
}

// Here's an example
var multiLineString = "This is a test\nto see if the function\nI am testing works\n"; // Variable containing your multi line string
var patternToSearch = "function"; // Variable containing the pattern you are searching in your multi line string

console.log(miniGrep(multiLineString, patternToSearch)); // Will return "to see if the function"