Home: Perl Programming Help: Frequently Asked Questions:
How can I access/change the first N letters of a s



Jasmine
Administrator

Jan 19, 2001, 2:49 PM


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

(From the Perl FAQ)

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

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

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

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

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

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

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