Perl substr Function

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Description

This function returns a substring of EXPR, starting at OFFSET within the string. 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 specified. If LEN is negative, leaves that many characters off the end of the string.

If REPLACEMENT is specified, replaces the substring with the REPLACEMENT string.

If you specify a substring that passes beyond the end of the string, it returns only the valid element of the original string.

Syntax

Following is the simple syntax for this function:

substr EXPR, OFFSET, LEN, REPLACEMENT

substr EXPR, OFFSET, LEN

substr EXPR, OFFSET

Return Value

This function returns string.

Example

Following is the example code showing its basic usage:

#!/usr/bin/perl -w

$temp = substr("okay", 2);
print "Substring valuye is $temp\n";

$temp = substr("okay", 1,2);
print "Substring valuye is $temp\n";

When above code is executed, it produced following result

Substring valuye is ay
Substring valuye is ka


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