diff --git a/pages/common/perl.md b/pages/common/perl.md
index 924cdc7db3..2b59ec5e2a 100644
--- a/pages/common/perl.md
+++ b/pages/common/perl.md
@@ -30,3 +30,7 @@
 - Run a multi-line find/replace expression on a file, and save the result in another file:
 
 `perl -p0e 's/{{foo\nbar}}/{{foobar}}/g' {{input_file}} > {{output_file}}`
+
+- Run a regular expression on `stdin`, printing out first capture group for each line:
+
+`cat {{path/to/input_file}} | perl -nle 'if (/.*({{foo}}).*/) {print "$1"; last;}'`