Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Re: Using a regex saved in an environment variable

by JavaFan (Canon)
on May 03, 2012 at 08:28 UTC ( #968674=note: print w/replies, xml ) Need Help??

in reply to Using a regex saved in an environment variable

Now I want to do the same thing except put the regular expression in an environment variable:

export REX="/--Begin--/ && /--End--/" echo $REX /--Begin--/ && /--End--/
But that's not a regexp; that's an expression.

You can do the interpolation in the shell, so that Perl sees what you intent it to see:

perl -00 -ne 'print if '$REX file.txt
Here, $REX is exposed to the shell, which sees the above as:
perl -00 -ne 'print if /--Begin--/ && /--End--/' file.txt

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://968674]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (15)
As of 2016-10-24 17:08 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (309 votes). Check out past polls.