From 2c3ea77cf7fbb2c51624dce6f3e996a342612907 Mon Sep 17 00:00:00 2001
From: Connor Olding <cloningdonor@gmail.com>
Date: Thu, 1 Sep 2022 18:16:58 -0700
Subject: [PATCH] add `grop4` utility for isolating IPv4s

---
 sh/grop4 | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 sh/grop4

diff --git a/sh/grop4 b/sh/grop4
new file mode 100644
index 0000000..8381fa9
--- /dev/null
+++ b/sh/grop4
@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+# YES_ZSH
+# YES_BASH
+# YES_DASH
+# YES_ASH
+
+grop4() { ### @- [`grop`](#grop) for IPv4s.
+    grep -oP -- '(?<=^|[^\d.])((0|1\d\d|2[0-4]\d|25[0-5]|[1-9]\d?)\.((?2))\.((?2))\.((?2)))(?=$|[^\d.])'
+}
+
+[ -n "${preload+-}" ] || grop4 "$@"