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From Source Snippets

// standart string replace functionality
function str_replace(haystack, needle, replacement) {
    var temp = haystack.split(needle);
    return temp.join(replacement);
}

// needle may be a regular expression
function str_replace_reg(haystack, needle, replacement) {
    var r = new RegExp(needle, 'g');
    return haystack.replace(r, replacement);
}