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  1. or download this
    use YAPE::Regex::Explain;
my $exp = YAPE::Regex::Explain->new($REx)->explain;
  2. or download this
    perl -MYAPE::Regexp::Explain -e "print YAPE::Regex::Explain->new('\bte
+st(?: more)\b$')->explain();"
  3. or download this
    The regular expression:

...
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
  4. or download this
    #!/usr/bin/perl

...
  test regexp
  \b
/x;