Character Relational Operators

The operators .NT., .IS., .IN. and .NI. are used to compare character strings.

         
<string1>.IS.<string2> .TRUE. if strings are equal
<string1>.NT.<string2> .TRUE. if strings are not equal
<string1>.IN.<string2> .TRUE. if <string1> is in <string2>
<string1>.NI.<string2> .TRUE. if <string1> is not in <string2>