diff --git a/src/test/regress/bin/diff-filter b/src/test/regress/bin/diff-filter
index a23088d0d..960726285 100755
--- a/src/test/regress/bin/diff-filter
+++ b/src/test/regress/bin/diff-filter
@@ -41,7 +41,7 @@ def main():
 		regexpipeline.append(re.compile(rule.group('rule')))
 
 	def sed(line):
-		if any(regex.match(line) for regex in regexpipeline):
+		if any(regex.search(line) for regex in regexpipeline):
 			return None
 		return line