TEXT in case constraint

Hi all! I'll try string variables in CASE. But I have error - "syntax error, unexpected TEXT" function casetest(string aaa) {     if aaa ~ "a1" then print "ok";     case aaa {     "a1" : print "a1";     "b1" : print "b1";     else: print "not a1, nor b1";     } } Sometimes it will be comfortable. Why it is error? -- Regards, Mikhail V. Majorov