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check string in c

Name: Anonymous 2009-05-24 9:14

what the fast way to check that string contain only characters within some set like "a-z0-9"?

Name: Anonymous 2009-05-24 12:01

>>3,1
if (!s1[strspn(s1, "abcdefghijklmnopqrstuvwxyz0123456789")])

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