How do I grep a string in Perl?

The grep() function in Perl used to extract any element from the given array which evaluates the true value for the given regular expression.

  1. Syntax: grep(Expression, @Array)
  2. Parameters:
  3. Returns: any element from the given array which evaluates the true value for the given regular expression.

Can I use grep in Perl?

With your perl script you are not using perl ‘s pattern matching capabilities. It would be possible to program everything in perl without using egrep . But I think it is easier to use find in combination with egrep . find /nfs/abc -type f -exec egrep -Hne ‘XYZ’ {} + may be a preferable version of that solution.

How do I search for a string in Perl?

To search for a substring inside a string, you use index() and rindex() functions. The index() function searches for a substring inside a string from a specified position and returns the position of the first occurrence of the substring in the searched string.

How do I grep a string from an array in Perl?

The Perl grep() function is a filter that runs a regular expression on each element of an array and returns only the elements that evaluate as true. Using regular expressions can be extremely powerful and complex. The grep() functions uses the syntax @List = grep(Expression, @array).

How do I grep multiple strings in Perl?

Grep Multiple Patterns To search for multiple patterns, use the OR (alternation) operator. The alternation operator | (pipe) allows you to specify different possible matches that can be literal strings or expression sets. This operator has the lowest precedence of all regular expression operators.

What does =~ mean in Perl?

Perl binding operator
=~ is the Perl binding operator. It’s generally used to apply a regular expression to a string; for instance, to test if a string matches a pattern: if ($string =~ m/pattern/) {

How do I use grep to find multiple words?

How do I grep for multiple patterns?

  1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
  2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
  3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
  4. Another option to grep two strings: grep ‘word1\|word2’ input.

Can you grep for two things?

Grep is a powerful utility available by default on UNIX-based systems. The name stands for Global Regular Expression Print. By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. You can grep multiple strings in different files and directories.