diff --git a/lib/core/agent.py b/lib/core/agent.py
index b7bd70f8c..8fadf1a1c 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -97,7 +97,7 @@ class Agent(object):
             if kb.postHint in (POST_HINT.SOAP, POST_HINT.XML):
                 origValue = origValue.split('>')[-1]
             elif kb.postHint == POST_HINT.JSON:
-                origValue = extractRegexResult(r"(?s):\s*(?P<result>\d+\Z)", origValue) or extractRegexResult(r'(?s)(?P<result>[^"]+\Z)', origValue)
+                origValue = extractRegexResult(r"(?s)\"\s*:\s*(?P<result>\d+\Z)", origValue) or extractRegexResult(r'(?s)(?P<result>[^"]+\Z)', origValue)
             else:
                 origValue = extractRegexResult(r"(?s)(?P<result>[^\s<>{}();'\"]+\Z)", origValue)
         elif place == PLACE.CUSTOM_HEADER: