The grep() function in Perl used to extract any element from the given array which evaluates the true value for the given regular expression.
Syntax: grep(Expression, @Array)
Parameters:
- Expression : It is the regular expression which is used to run on each elements of the given array.
- @Array : It is the given array on which grep() function is called.
Returns: any element from the given array which evaluates the true value for the given regular expression.
Example 1:
#!/usr/bin/perl# Initialising an array of some elements@Array = ('Geeks', 'for', 'Geek');
# Calling the grep() function@A = grep(/^G/, @Array);
# Printing the required elements of the arrayprint @A;
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Output:
GeeksGeek
In the above code, Regular expression /^G/ is used to get the element starting with ‘G’ from the given array and discard the remaining elements. Example 2:
#!/usr/bin/perl# Initialising an array of some elements@Array = ('Geeks', 1, 2, 'Geek', 3, 'For');
# Calling the grep() function@A = grep(/\d/, @Array);
# Printing the required elements of the arrayprint @A;
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Output :
123
In the above code, Regular expression /^d/ is used to get the integer value from the given array and discard the remaining elements.
Example 3:
#!/usr/bin/perl# Initialising an array of some elements@Array = ('Ram', 'Shyam', 'Rahim', 'Geeta', 'Sheeta');
# Calling the grep() function@A = grep(!/^R/, @Array);
# Printing the required elements of the arrayprint @A;
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Output :
ShyamGeetaSheeta
In the above code, Regular expression !/^R/ is used to get the elements not starting with ‘R’ and discard the elements which start with ‘R’.