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    print $RE{delimited}{-delim => 'ab'};
  2. or download this
    (?:(?|(?:a)(?:[^\\a]*(?:\\.[^\\a]*)*)(?:a)|(?:b)(?:[^\\b]*(?:\\.[^\\b]
+*)*)(?:b)))
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    print $RE{delimited}{-delim => '[\\\/]'};
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    (?:(?|(?:\[)(?:[^\\\[]*(?:\\.[^\\\[]*)*)(?:\[)|(?:\\)(?:[^\\]*(?:(?:\\
+\\)[^\\]*)*)(?:\\)|(?:\\)(?:[^\\]*(?:(?:\\\\)[^\\]*)*)(?:\\)|(?:\/)(?
+:[^\\\/]*(?:\\.[^\\\/]*)*)(?:\/)|(?:\])(?:[^\\\]]*(?:\\.[^\\\]]*)*)(?
+:\])))
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    print qr'a';
print "\n\n";
print $RE{delimited}{-delim => qr'a'};
print "\n";
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    (?^:a)

(?:(?|(?:\()(?:[^\\\(]*(?:\\.[^\\\(]*)*)(?:\()|(?:\?)(?:[^\\\?]*(?:\\.
+[^\\\?]*)*)(?:\?)|(?:\^)(?:[^\\\^]*(?:\\.[^\\\^]*)*)(?:\^)|(?:\:)(?:[
+^\\\:]*(?:\\.[^\\\:]*)*)(?:\:)|(?:a)(?:[^\\a]*(?:\\.[^\\a]*)*)(?:a)|(
+?:\))(?:[^\\\)]*(?:\\.[^\\\)]*)*)(?:\))))