From 0098f689f6db2db09e40af46db4420111a847a9f Mon Sep 17 00:00:00 2001
From: Richard Ipsum <richardipsum@fastmail.co.uk>
Date: Tue, 7 Apr 2015 10:38:21 +0100
Subject: moar regex

---
 swift-storage.configure | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/swift-storage.configure b/swift-storage.configure
index f410bea6..078a8390 100644
--- a/swift-storage.configure
+++ b/swift-storage.configure
@@ -20,9 +20,13 @@ set -e
 export ROOT="$1"
 
 validate_number() {
-    if ! echo -n "$2" | grep -xq '[0-9]\+'
+    local name="$1"
+    local value="$2"
+
+    local pattern='[0-9]+'
+    if ! [[ "$value" =~ $pattern ]]
     then
-        echo "'$1' must be a number" >&2
+        echo "'$name' must be a number" >&2
         exit 1
     fi
 }
-- 
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