Custom Javascript function - getElementsByAttribute

getElementsByAttribute

document.getElementsByAttribute=function(attrN,attrV,multi){
    attrV=attrV.replace(/\|/g,'\\|').replace(/\[/g,'\\[').replace(/\(/g,'\\(').replace(/\+/g,'\\+').replace(/\./g,'\\.').replace(/\*/g,'\\*').replace(/\?/g,'\\?').replace(/\//g,'\\/');
    var
        multi=typeof multi!='undefined'?
            multi:
            false,
        cIterate=document.getElementsByTagName('*'),
        aResponse=[],
        attr,
        re=new RegExp(multi?'\\b'+attrV+'\\b':'^'+attrV+'$'),
        i=0,
        elm;
    while((elm=cIterate.item(i++))){
        attr=elm.getAttributeNode(attrN);
        if(attr &&
            attr.specified &&
            re.test(attr.value)
        )
            aResponse.push(elm);
    }
    return aResponse;
}

Usage
Syntax to consume this function :

document.getElementsByAttribute([string attributeName],[string attributeValue],[boolean isCommaHyphenOrSpaceSeparatedList:false])

Example :

document.getElementsByAttribute("type", "button", false);

Where
1. "type" is attributename of any element.
2. "button" is value of attribute
3. "false" is whether - isCommaHyphenOrSpaceSeparatedList or not.