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Actually I've used regex pattern on url to replace its string. I tried to replace the "www." from the url. Now, I would like to know that is there any benefit or problem to use regex pattern instead to put that exact string.

For example, sting.replace("/w{3}./","") vs string.replace("www.","");

I am asking about the topic like execution time.

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    Which language? Also, please include valid syntax.. Anyway, generally one would use a regular expression when a literal string replacement wouldn't work. The biggest downside of a regular expression, IMOHO, is accidental forgetting to escape special characters (as shown) - especially if it comes from user input. "Performance" is usually irrelevant. Commented Jun 22, 2015 at 4:53
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    string.replace won't take regex as an argument. Commented Jun 22, 2015 at 4:54
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    hmm the . in question would be a metacharacter if not escaped :) Commented Jun 22, 2015 at 4:56
  • For .net, stackoverflow.com/questions/1620410/… Commented Jun 22, 2015 at 5:21
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