string manipulation - Why is StringMatchQ["IP1", "IP"] returning False?

Maybe there is a knot in my head, but I would expect that

StringMatchQ["IP1", "IP"]

should return True (which it does not) just as

StringFreeQ["IP1", "IP"]

returns False (which it does). What am I missing?

Answer

StringMatchQ tests the pattern, and "IP1" doesn't match the pattern "IP", it does match the pattern ___~~"IP"~~___, but that's a different pattern! Similarly you could write your pattern as StringMatchQ["IP1", "IP*"]

StringFreeQ however doesn't just test the entire string, it tests every substring, so in effect the ___~~pattern~~___ is added by the function itself to your pattern.

Comments

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