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BUILT-IN MATHEMATICA SYMBOL
StringFreeQ
StringFreeQ["string", patt]
yields True if no substring in 
matches the string expression patt, and yields False otherwise.
StringFreeQ["string", {patt1, patt2, ...}]
yields True if no substring matches any of the 
.
StringFreeQ[{s1, s2, ...}, p]
gives the list of results for each of the 
.
New in 5.1
