index

Description

The index function searches for a substring within a string and returns the position of the first occurrence. If the substring is not found, it returns -1.

An optional third argument specifies the position at which to start searching. This allows finding subsequent occurrences of a substring by calling index repeatedly with increasing positions.

index performs case-sensitive matching. For case-insensitive searches, convert both strings to the same case with lc or uc before searching. The companion function rindex searches from the end of the string.

Arguments

Example

my $str = 'Hello, World!';
print index($str, 'World');  # 7
print index($str, 'xyz');    # -1
print index($str, 'l', 4);  # 10

Reference

• Official Documentation