[OpenSER-Users] Variable comparison symbols...

[Iñaki Baz Castillo]

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El Wednesday 14 November 2007 01:01:45 Brian Heath escribió:
>     I'm almost embarassed to ask...  But is there a place where one can
> read about the symbols:   ~  ^  \  $  ?  +    and what they do/mean?
>
>     For example, consider this following line:
>
>  if (!(uri =~
> "^sip:.+@(255\.255\.255\.255|(sip\.|sip5\.)?mydomain\.com):5080$"))
>
>     It looks like, to me, that it's checking to make sure that uri is NOT
> equal to any of combination of the data following the @ - but I'm not so
> sure exactly what I'm reading.  ie:  the ~ after the =, the ^ in front of
> sip, the .+ in front of @, the ? before mydomain and the trailing $.... 
> And why the period has the \ in front of them all...?

=~ means regular expresion comparison.

For example:

( "abc" == "123" ) -->  False
( "abc" =~ "^a" ) --> True


^ means starting with. This is:
"^abc" matches lines starting with "abc".

$ means line ending.

? means any character (0 or more times if I'm not wrong)



But sure sure you should look for any regular expressions manual. for example 
look in google for "unix regular expressions". There are lots of good 
manuals ;)





-- 
Iñaki Baz Castillo
ibc at in.ilimit.es