From 63b0469a7b4f58119e367db7a1c784923a40966c Mon Sep 17 00:00:00 2001
From: Henry Weller <http://openfoam.org>
Date: Tue, 24 Jul 2018 11:54:17 +0100
Subject: [PATCH] tutorials::coolingSphere/Allclean: avoid extended regular
 expressions in grep

Solves grep problem on Slackware 14.2

Patch contributed by Lorenzo Trevisan
Resolves patch request https://bugs.openfoam.org/view.php?id=3012
---
 .../heatTransfer/chtMultiRegionFoam/coolingSphere/Allclean      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/Allclean b/tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/Allclean
index 2e0aebff6..6966e9f41 100755
--- a/tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/Allclean
+++ b/tutorials/heatTransfer/chtMultiRegionFoam/coolingSphere/Allclean
@@ -6,7 +6,7 @@ cd "${0%/*}" || exit 1    # Run from this directory
 
 removeRegionDirs () {
     # HACK to get regionDirs from materialProperties
-    _regionDirs="$(grep -E "^[a-Z]" constant/materialProperties | tail -n +2)"
+    _regionDirs="$(grep "^[a-zA-Z]" constant/materialProperties | tail -n +2)"
 
     for _d in system constant
     do