Perl: Getting substring of a number

perl substring regex
perl extract substring
perl substring match
perl string length
perl substring after character
perl string functions
perl split
perl index

When I run the below code I'm expecting to get 3 but instead I get 345. what's the best way to achieve this?

#!/usr/bin/env perl

my $input = "12345";
my $number = substr($input, 2, 3);
print $number;

Edit: Thanks all for your answers, I now see my mistake in believing it was first and last index.

The documentation for substr() states that the third parameter is the length of the string you want to fetch.

my $input = "12345";

my $num = substr($input, 2, 1);

So $input is the string, 2 is the offset, and 1 is the number of characters to fetch (or 'Length', per the documentation).

Perl, substr() in Perl returns a substring out of the string passed to the function starting from a given index up to the length specified. This function by� Perl: Getting substring of a number. Ask Question Asked 3 months ago. Active 3 months ago. Viewed 62 times 0. When I run the below code I'm expecting to

The 3rd arg to substr is the string length:

my $number = substr($input, 2, 1);

Perl substr example, $firstname = substr($name, 0, 5);. I used the number 0 as my starting position, as that represents the first character in the string. perl. $ perl sub.pl first name: alvin last name: alexander Perl substr - things to remember The most important thing to remember is that the starting position is a zero-based number, so when I grabbed my first name from the string, like this:

Just for fun can be done like following

use strict;
use warnings;

use feature 'say';

my $input = "12345";

my $number_1 = (split '', $input)[2];
my @number_2 = (split '', $input)[2..4];

say $number_1;
say @number_2;

output

3
345

String functions: length, lc, uc, index, substr, perl substr(STRING, OFFSET, LENGTH, REPLACEMENT) - extract any There are a number Duration: 12:18 Posted: Feb 20, 2013 If OFFSET and LENGTH specify a substring that is partly outside the string, only the part within the string is returned. If the substring is beyond either end of the string, substr returns the undefined value and produces a warning. When used as an lvalue, specifying a substring that is entirely outside the string raises an exception.

Perl substr Function, If OFFSET is negative, starts that many characters from the end of the string. If LEN is specified, returns that number of bytes, or all bytes up until end-of-string if not� Perl is a programming language used primarily to develop web applications. Perl is an interpreted, not compiled, language. Perl is an interpreted, not compiled, language. This means its programs take up more CPU time than a compiled language — a problem that becomes less important as the speed of processors increases.

Perl: Getting substring of a number, The documentation for substr() states that the third parameter is the length of the string you want to fetch. my $input = "12345"; my $num� Perl string functions. Perl provides a set of functions that allow you to manipulate strings effectively. We cover the most commonly used string functions in the following section for your reference. Perl string length. To find the number of characters in a string, you use the length() function. See the following example:

Using the Perl substr() function, substr() has a variable number of arguments, it can be told to start at an offset from either end of the expression, you can supply a replacement string so that it� Lazer is asking for a number, not just an integer. This regexp will drop ., e which may be used to form a float. Also \d is not just [0-9], due to Unicode support in Perl: digits in others glyphs (such as indian) are valid.

Comments
  • Change the third parameter to substring(), which is the length of the extracted substring, from 3 to 1?