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G:\cblead2\win32>perl -e "print $& if 'foobar'=~/foo|foobar/"
foo
...
foobar
G:\cblead2\win32>perl -e "print $& if 'foobar'=~/foo(?:bar)?/"
foobar

G:\>g:\perl_trie\bin\perl regexp.pl --words=foo;foobar;baz;bop;brief;z
+oo g:\perl_blead\bin\perl.exe
used the following Regex modules: Regexp::List, Regexp::Assemble,
...
A_smpl  124/s    73%    64%    64%   63%    50%   49%    49%    18%   
+ 9%     --

G:\>