From 53b2053045f05669b5889713c98c45e77635bea6 Mon Sep 17 00:00:00 2001
From: Fabien Bochu <fabien.bochu@polyconseil.fr>
Date: Tue, 10 Mar 2015 15:55:46 +0100
Subject: Fix ISO8601_PERIOD_REGEX to not match 'P'

---
 src/isodate/isoduration.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/isodate/isoduration.py b/src/isodate/isoduration.py
index af44661..c48ee34 100644
--- a/src/isodate/isoduration.py
+++ b/src/isodate/isoduration.py
@@ -41,7 +41,8 @@ from isodate.isostrf import strftime, D_DEFAULT
 
 ISO8601_PERIOD_REGEX = re.compile(
     r"^(?P<sign>[+-])?"
-    r"P(?P<years>[0-9]+([,.][0-9]+)?Y)?"
+    r"P(?!\b)"
+    r"(?P<years>[0-9]+([,.][0-9]+)?Y)?"
     r"(?P<months>[0-9]+([,.][0-9]+)?M)?"
     r"(?P<weeks>[0-9]+([,.][0-9]+)?W)?"
     r"(?P<days>[0-9]+([,.][0-9]+)?D)?"
-- 
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