Re: PCRE

[Assaf Gordon]

(follow-up from a private message)

Hi Michael,

If all you need is sed's substitution command but want it with PRCE 
regex capabilities, the following is a quick way:

   perl -pe 's/ XXXX / YYYY /g' INPUT > OUTPUT
   perl -pe 's/ XXXX / YYYY /g' < INPUT > OUTPUT

"perl -e PROG" tells perl to execute PROG
instead of reading the perl script from a file (similar to "sed -e").

"perl -p" will run the specified command in an loop over
each line of the input file, and will print the current line
(after any modifications you made to it).

The following are equivalent:

  seq 10 |  sed -E -e 's/([2357])/Found prime: \1/g'
  seq 10 | perl -p -e 's/([2357])/Found prime: \1/g'


Of course I'm glossing over many details,
perl is much more complicated and powerful than sed - but hopefully
it'll get you started.

These could help as well:
  https://blogs.oracle.com/ksplice/the-top-10-tricks-of-perl-one-liners
  http://www.math.harvard.edu/computing/perl/oneliners.txt


regards,
 - assaf