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Possible Duplicate:
Regex.IsMatch vs string.Contains
Which is faster, preferable and why?
What the difference in mechanisms between two?
I need to search for some values from UserAgent, most of values can be used without wildcards (e.g. if I want to catch cellular phones I search for iPhone instead of *iPhone* wildcards).
Try measuring. But this is the wrong question, see below.
If I want to match a fixed string
String.Containsdoes just what I need. If I need to pattern match, thenString.Containsis useless.Comparing the performance of these is irrelevant, they do completely different things. Use the right tool first, and only then if your performance is a problem use profiling to identify hot parts of your code to look at.