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perl — The Perl 5 language interpreter. See also: `perldoc`. More information: <https://perldoc.perl.org/pe

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the perl command: The Perl 5 language interpreter. See also: perldoc. More information: <https://perldoc.perl.org/perl>.

Solution

perl — The Perl 5 language interpreter. See also: perldoc. More information: <https://perldoc.perl.org/perl>.

Print lines from stdin [m]atching regex1 and case [i]nsensitive regex2:

perl -n -e 'print if m/regex1/ and m/regex2/i'

Say ([-E]) first match group, using a regex, ignoring space ([x]) in regex:

perl -n -E 'say $1 if m/{{before}} ( {{group_regex}} ) {{after}}/x'

[i]n-place, with backup, [s]ubstitute all occurrence ([g]) of regex with a replacement:

perl -i'.bak' -p -e 's/regex/{{replacement}}/g' {{path/to/files}}

Code Snippets

Print lines from `stdin` [m]atching `regex1` and case [i]nsensitive `regex2`

perl -n -e 'print if m/regex1/ and m/regex2/i'

Say ([-E]) first match group, using a `regex`, ignoring space ([x]) in `regex`

perl -n -E 'say $1 if m/{{before}} ( {{group_regex}} ) {{after}}/x'

[i]n-place, with backup, [s]ubstitute all occurrence ([g]) of `regex` with a replacement

perl -i'.bak' -p -e 's/regex/{{replacement}}/g' {{path/to/files}}

Context

tldr-pages: common/perl

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