Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Re^4: trim leading & trailing whitespace

by tlm (Prior)
on Mar 30, 2005 at 10:41 UTC ( #443402=note: print w/ replies, xml ) Need Help??


in reply to Re^3: trim leading & trailing whitespace
in thread trim leading & trailing whitespace

How about this:

$_ = " yes \n \n \n they \n \n will \n\n\n"; s/^\s*?(?:\b(.*?)\s*?)?(\n)?$/$1$2/gm; print; __END__ % perl 443391.pl yes they will

the lowliest monk


Comment on Re^4: trim leading & trailing whitespace
Download Code
Re^5: trim leading & trailing whitespace
by bart (Canon) on Mar 30, 2005 at 11:10 UTC
    Danger, don't use \b if you want to detect the edges between spaces an nonspaces. It won't work for nonspace+nonword characters, like quotes and punctuation.

    Perhaps replace the \b(.*?) with (\S.*?).

    Still, you're not running this with warnings enabled, are you? Both $1 and $2 are optional, so both can be undef, but you use their value regardless. This runs without warnings:

    s/^\s*?((?:\S.*?)?)\s*?(\n?)$/$1$2/gm;

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://443402]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (10)
As of 2014-09-17 13:58 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (81 votes), past polls