How to find the Indices of All Occurrences of Substring in Perl - Step by Step Examples
How to find the Indices of All Occurrences of Substring in Perl ?
Answer
To find the indices of all occurrences of a substring in Perl, you can use the index
function in a loop to find matches and store their indices.
✐ Examples
1 Find Indices of All Occurrences in String
In this example,
- We create a string variable
$str
with a string value. - We create a string variable
$substr
to store the substring we want to find. - We use a loop with the
index
function to find matches and store their indices. - We print the indices of all occurrences.
Perl Program
my $str = "Hello Hello Hello";
my $substr = "Hello";
my @indices;
my $pos = -1;
while (($pos = index($str, $substr, $pos + 1)) != -1) {
push @indices, $pos;
}
print "Indices of all occurrences: @indices\n";
Output
Indices of all occurrences: 0 6 12
2 Find Indices of All Occurrences in Another String
In this example,
- We create two string variables
$str
and$substr
with different values. - We use a loop with the
index
function to find matches and store their indices. - We print the indices of all occurrences.
Perl Program
my $str = "apple banana cherry banana";
my $substr = "banana";
my @indices;
my $pos = -1;
while (($pos = index($str, $substr, $pos + 1)) != -1) {
push @indices, $pos;
}
print "Indices of all occurrences: @indices\n";
Output
Indices of all occurrences: 6 20
Summary
In this tutorial, we learned How to find the Indices of All Occurrences of Substring in Perl language with well detailed examples.
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