examples of ~= operator

Rudy Zijlstra rudy at grumpydevil.homelinux.org
Tue Dec 13 10:57:33 UTC 2011


The man page gives me:

        data-expression-1 ~= data-expression-2 data-expression-1 ~~ 

          The  ~=  and  ~~  operators (not available on all systems) 
perform extended regex(7) matching of the values of two
          data expressions, returning true if data-expression-1 matches 
against the regular expression  evaluated  by  data-
          expression-2,  or false if it does not match or encounters 
some error.  If either the left-hand side or the right-
          hand side are null, the result is also false.  The ~~ operator 
differs from the ~= operator in that  it  is  case-

Unfortunately, it does not give any example, and i am hoping to use this 
to check if a sub-string is present in an option string received from a 



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