Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

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]
[stevieb]: My GPIO expander chips should arrive tomorrow, but I think I'll throw a shift register against them and see if all six I have will turn at once. Amps are near the breaking point, but I want to know max sustainable V and I output.

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (6)
As of 2018-03-22 22:18 GMT
Find Nodes?
    Voting Booth?
    When I think of a mole I think of:

    Results (286 votes). Check out past polls.