[OpenSIPS-Users] An obstacle with using variables in regular expression

[Răzvan Crainea]

Hi, Donat!

Your code is checking the variable with the "^$var(each)" 
string/literal, the variable is not expanded within the quotes (like it 
is done in php).
In order to fix this, you should do something like:
$var(regex) = "^" + $var(each);
if ($rU ~= $var(regex))

Best regards,
Răzvan

On 2/19/20 3:40 PM, Donat Zenichev wrote:
> Hi OpenSIPS community!
> I've come across one small obstacle, when trying to use pseudo variables
> or attribute value pairs in regular expression.
> 
> I believe my mistake should be quite simple.
> 
> Regular expression is used in a condition:
> if ( $rU =~ "^$var(each)" )
> 
> $var(each) - is a string variable, not integer. It contains certain 
> prefix, like "44".
> 
> For some reason OpenSIPS script is not able to get through this check 
> properly.
> But, in case I hardcode something like this:
> if ( $rU =~ "^44" )
> then it passes a check as needed.
> 
> To my shame, I spent several hours trying to solve this in different 
> ways, but without any success.
> 
> I think that the problem consists of extra quotes appearing when 
> $var(each) comes into play.
> So I have first quoting defined in a condition, they wrap regular exp: 
> ^$var(each)
> And when $var(each) is defined in a condition, it gets quotes too, since 
> it's a string.
> 
> Of course I can use some other way to run this check, for example with 
> help of regex module.
> But my curiosity doesn't give me any chance to set this case aside.
> 
> Any advice is appreciated!
> 
> -- 
> 
> Best regards,
> Donat Zenichev
> 
> 
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> 

-- 
Răzvan Crainea
OpenSIPS Core Developer
   http://www.opensips-solutions.com