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  1. or download this
    s/\bold\b/new/gi; 
#  1: replaces all instances of the string, e.g. "old", 
...

s/\bOLD\b/NEW/gi; 
#  4: replaces same variants of "OLD" as in 1 with "NEW"
  2. or download this
    #!/usr/bin/perl

use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr/\bold\b/i)->explain;
  3. or download this
    The regular expression:

...
)                        end of grouping
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