UNIX for Advanced & Expert Users

# put end bracket first
   if [[ $LINE = +([]a-z A-Z [+|. _~ 0-9-]) ]]
      then echo good
      else  echo "contains bad"
   fi

#!/opt/ast/bin/ksh

print ${.sh.version}

set -- ')' ' ' "'" 'abc' '\' 42 '\)ab('

for w; do
  if [[ $w = *[\'\\\)\(]* ]]; then 
    print "match found for ->$w<-"
  else  
    print "no match  found for ->$w<-"
  fi
done

~/t $ ./s                                                                                                          
Version JM 93u 2011-02-08
match found for ->)<-
no match  found for -> <-
match found for ->'<-
no match  found for ->abc<-
match found for ->\<-
no match  found for ->42<-
match found for ->\)ab(<-

man ksh|grep "\+("

... and to find it when in "man ksh" with common man PAGER settings
/\+\(