Update regex.md

pew · May 27, 2024 · 19a178a · 19a178a
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@@ -29,6 +29,12 @@ this will match everything after `repos/`, the `K` is important here. the `.*` s
 
 to use it in editors like bbedit, use `^[\s]*$\n`
 
+## remove blank space end of line
+
+```
+\s+$
+```
+
 ## google re2 / golang(?)
 
 match `foo.example.com` and `foo-bar.example.com`: