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How can I access/change the first N letters of a string?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:20 UTC ( #598=perlfaq nodetype: print w/replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

There are many ways. If you just want to grab a copy, use substr():

    $first_byte = substr($a, 0, 1);

If you want to modify part of a string, the simplest way is often to use substr() as an lvalue:

    substr($a, 0, 3) = "Tom";

Although those with a pattern matching kind of thought process will likely prefer:

    $a =~ s/^.../Tom/;

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[Lady_Aleena]: shmem, thanks. I'm am way out of practice.
[shmem]: perl -lE '@foo = (0..3);@bar = (4..7); push @foo,@bar; say for @foo'
[Lady_Aleena]: shmem, I feel like an idiot for forgetting something so basic.
shmem puts a big cauldron of "silly con charme" on the table in the refectorium
[reisinge]: 'push @foo, @bar' is the same as '@foo = (@foo ,@bar)' ?
[shmem]: yes, at least for the result in @foo

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