Graphs

[Andreas Ericsson]

martinus.nel at scarceskills.com wrote:
> Michael,
> 
> Since you are successful with it, may we lesser beings view some of your
> templates, especially the regexp ones ? :)
> 
> Just in case someone here thinks that I am desperate ... yes I am, I just
> can't seem to get the hang of the regular expressions :-)
> 

It's really pretty straightforward, so long as you remember a couple of 
simple rules;
[abc] denotes a character class and matches any of the characters a, b or c.
* means 'match any or none of the previous character (class)'
. means 'match any char'.
There are others as well, but those are the ones that doesn't require 
odd escaping. Fling around with grep and sed a bit and I'm sure you'll 
get the idea. For instance, try;
grep '.*foo.*'
and then type a lot of gibberish. The lines you type with 'foo' 
somewhere in them will match and be printed twice.

Regex matching with substitutions works the same way, but it has 
delimiters at the beginning, the end and between the match and the 
substitution. The delimiter can be any char, but / and , and # and | are 
commonly seen in shell-scripts.
thus
sed 's/foo/bar/'
(gibberish goes here)
will replace (the leading s in the sed command means substitute) foo 
with bar in any text you type.

Fool around a bit. It's the best way to learn, and you'll learn more as 
you go along. Should all else fail, pick up a book on perl. It's main 
feature is just that, regexing, so they're bound to be covered in detail.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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