perl -wle 'for (0 .. 255) { 
   $delim = chr;
   next if $delim =~ /\w/;
   eval "m$delim...$delim";
   print "Bad: $_ ($delim)" if $@ 
}'

Bad: 9 ( )    # tab
Bad: 10 (     # newline
)
Bad: 12 (     # formfeed
         )
)ad: 13 (     # carriage return
Bad: 32 ( )   # substitute
Bad: 40 (()   # OK paired
Bad: 46 (.)
Bad: 59 (;)
Bad: 60 (<)   # OK paired
Bad: 91 ([)   # OK paired
Bad: 123 ({)  # OK paired
Bad: 137 (_)  # warns only, but it's wrong

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In reply to Re: Regex delimiter by PreferredUserName
in thread Regex delimiter by Outaspace

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