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I would like to know the best program (Surely a text editor) to make string manipulation like string substituion.

By the way, I would like to do the next: String manipulation of type String substitution in mathematical expression

Thank you so much!

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On what platform? – GreenMatt Nov 23 '10 at 14:58
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To do the type of manipulation you asked about in your previous question, Perl or Python are your best bets (my answer there uses Perl). AWK might be able to do it. It would take a really complex sed script to even come close. It may be that the regex processing in vim or emacs is up to the challenge. @GreenMatt: The One True Platform - Windows. ;-) – Dennis Williamson Nov 23 '10 at 19:53
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closed as not constructive by slhck, Simon Sheehan, Nifle, Daniel Beck, Oliver Salzburg Mar 11 at 15:31

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My preferences are in this order: perl, vim (vi, gvim, etc.) substitution commands, sed, and awk.

perl is a heavy software program that can do math as well. See http://perlmonks.org/ for more details.

Vi is the well known text editor all *ix systems have (Linux, Unix, etc.), which, incidentally, can do some nice scripting.

Sed is, well see http://linux.die.net/man/1/sed

Awk (gawk and its brethren) is, well see http://linux.die.net/man/1/awk

... almost forgot. The absolute best, and with a price tag to match, is PowerGrep. Without a doubt, the easiest way to formulate complex queries and replacements of text in DOC, TXT, and other files.

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superuser.com/questions/39384/best-grep-like-tool if you are interested in regular expressions and Grep – Rolnik Nov 23 '10 at 15:10
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Take a look at sed

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