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Can be a literal like "abc" or any other regular expression. Regular Expressions provides an overview of regular expression syntax. "regExpPattern" must be enclosed in double quotes. An introduction into regular expressions can be found at Regular-Expressions.info. 

The example below assigns the boolean result of the relational expression with unlike operator to variable b1 . The expression evaluates to true if the string s1 is not " abc ".

set b1 = s1 unlike "abc";

The example below assigns the boolean result of the relational expression with unlike operator to variable b2 . The expression evaluates to true if the string s2 does not contain at least one letter or only lower case letters.

set b2 = s2 unlike "[a-z]+";