BUILT-IN MATHEMATICA SYMBOL

StringFreeQ

yields True if no substring in

matches the string expression patt, and yields False otherwise.

yields True if no substring matches any of the

.

gives the list of results for each of the

.

The string expression patt can contain any of the objects specified in the notes for StringExpression.

Setting the option IgnoreCase->True makes StringFreeQ treat lowercase and uppercase letters as equivalent.

Test whether a string pattern contains a substring matching the pattern:

Check that a string is free of "a":

Test whether a string pattern contains a substring matching the pattern:

Out[1]=

Check that a string is free of "a":

Out[1]=

Use string patterns:

Use a regular expression:

Pattern matching for dates:

Mixed regular expressions and string patterns:

Occurrences of either pattern:

StringFreeQ automatically threads over lists of strings:

Use IgnoreCase->True to check for the presence of substrings regardless of case:

Pick all the lines that contain a substring that matches the pattern:

Line numbers with corresponding texts that contain "noon" or "day of":

StringMatchQ checks whether a whole string matches a pattern:

StringFreeQ checks whether a substring matches a pattern:

Get the starting and ending positions where a substring occurs by using StringPosition:

Use StringCases to extract substrings matching a given pattern: