c# - Regex modification -

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i absolutely stupid when comes regex. have been trying modify following expression match urls begin www. matches urls begin http, ftp, , https not plain www. have not had success on own. appreciated.

regex.ismatch(text, @"(^(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?)")

thanks in advance!

make this...

(http|ftp|https):\/\/

into this...

((http|ftp|https):\/\/|www\.)

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