How to Check if String starts with Specific Prefix in Perl - Step by Step Examples

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How to Check if String starts with Specific Prefix in Perl ?

Answer

To check if a string starts with a specific prefix in Perl, you can use the index() function or regular expressions.

✐ Examples

1 Check if "Hello World" starts with prefix "Hello"

In this example,

We create a string named $str1 with a value of "Hello World".
We use the index() function or regular expression to check if $str1 starts with the prefix "Hello".
The index() function returns the starting position of the substring if found; otherwise, it returns -1.
Finally, we print the result to standard output.

Perl Program

$str1 = "Hello World";
$start_with_hello = index($str1, "Hello") == 0;
print "String starts with prefix 'Hello': $start_with_hello\n";
# or using regular expressions
$start_with_hello_regex = $str1 =~ /^Hello/;
print "String starts with prefix 'Hello' (using regex): $start_with_hello_regex\n";

Output

String starts with prefix 'Hello': 1
String starts with prefix 'Hello' (using regex): 1

2 Check if "apple" starts with prefix "banana"

In this example,

We create a string named $str2 with a value of "apple".
We use the index() function or regular expression to check if $str2 starts with the prefix "banana".
The index() function returns the starting position of the substring if found; otherwise, it returns -1.
Finally, we print the result to standard output.

Perl Program

$str2 = "apple";
$start_with_banana = index($str2, "banana") == 0;
print "String starts with prefix 'banana': $start_with_banana\n";
# or using regular expressions
$start_with_banana_regex = $str2 =~ /^banana/;
print "String starts with prefix 'banana' (using regex): $start_with_banana_regex\n";

Output

String starts with prefix 'banana': 
String starts with prefix 'banana' (using regex):

Summary

In this tutorial, we learned How to Check if String starts with Specific Prefix in Perl language with well detailed examples.

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