From 21e9d5c5c3d9384e15339ac7cf03a5bf639f8e4d Mon Sep 17 00:00:00 2001
From: miller86 <miller86@llnl.gov>
Date: Tue, 27 Oct 2015 16:51:00 -0700
Subject: [PATCH] generalize one of the cases to handle many more kinds of
 formatting options

---
 lib/spack/spack/url.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/spack/spack/url.py b/lib/spack/spack/url.py
index 58838306af..6adbfe156d 100644
--- a/lib/spack/spack/url.py
+++ b/lib/spack/spack/url.py
@@ -209,8 +209,8 @@ def parse_version_offset(path):
         # e.g. foobar-4.5.1
         (r'-((\d+\.)*\d+)$', stem),
 
-        # e.g. foobar-4.5.1b
-        (r'-((\d+\.)*\d+\-?([a-z]|rc|RC|tp|TP)\d*)$', stem),
+        # e.g. foobar-4.5.1b, foobar4.5RC, foobar.v4.5.1b
+        (r'[-._]?v?((\d+\.)*\d+[-._]?([a-z]|rc|RC|tp|TP?)\d*)$', stem),
 
         # e.g. foobar-4.5.0-beta1, or foobar-4.50-beta
         (r'-((\d+\.)*\d+-beta(\d+)?)$', stem),
-- 
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