Regular expression random match

[Guest taliesin]

This took me quite a while to figure out. Sometimes the Search funtion is just not good enough and you need the power of regular expressions.

 

Javascript code to be saved in a file and referenced.

function RegularExpressionRandomMatch(regularExpression, positionMatch, flags)
{
    positionMatch = positionMatch || "0";
    flags = flags || "g";
    
    var stringToMatchAgainst = context.document.documentElement.innerHTML;
    var regex = new RegExp(regularExpression, flags);
    
    var matches = [];
    while ((match = regex.exec(stringToMatchAgainst)) != null)
    {
        matches.push(match)
    }
    
    var numberOfMatches = matches.length;
    if (numberOfMatches < 1) return "";
    var randomNumber = Math.floor(Math.random() * numberOfMatches);
    var randomMatch = matches[randomNumber][positionMatch];
    return randomMatch;
}

 

Example usage (add a javascript function)

 

Function Name:

RegularExpressionRandomMatch

 

Function Parameters:

updateBasket\('(\d+)','0','0'\)

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