$1 - can it be 'reset to null' ?

Question

$1 - can it be 'reset to null' ?

delinde (Programmer)

(OP)

29 Aug 12 16:02

If you are doing RegEx work, and you want to be sure that $1 is null, you cannot do this:

$1 = ""; ## This will produce an error: $1 is read only

But you can do this:

m/()()()/; ## will reset $1, $2 and $3 to be nothing

HTH, delinde

rharsh (TechnicalUser) · Answer 1 · 2012-08-30 03:19:25

Another approach, rather than checking to see if there is a value in $1, $2 and $3, could be to do something like:

CODE

if ($someVar =~ m/(.)(..)(...)/) {
    # execute this block if the regex succeeds
    # also means $1, $2 and $3 were set
} else {
    # regex did not match - execute this block
}

predamarcel (IS/IT--Management) · Answer 2 · 2012-09-05 17:22:01

Hi there,

The sortest way to reset all $N variable is to call for a match like:
/.?/;
This will ever be successful and all the matching vars are reset.

BR,
Marcel

___
http://www.notnull.ro/log
____

NateBro (Programmer) · Answer 3 · 2012-11-21 22:17:59

now thats real short predamarcel!

~Nate_Bro

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$1 - can it be 'reset to null' ?