StringFreeQ

StringFreeQ["string",patt] yields True if no substring in "string" matches the string expression patt, and yields False otherwise.

StringFreeQ["string",{patt1,patt2,…}] yields True if no substring matches any of the patti.

StringFreeQ[{string1,string2,…},patt] gives a list of the results for each of the "stringi".

StringFreeQ[patt] represents an operator form of StringFreeQ that can be applied to an expression.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.