diff --git a/tools/get_pr_ut.py b/tools/get_pr_ut.py
index 373ff56135ec45d9fe578c159c39b9c5f2857911..c964f12a77e07b9330de183d0d1f092801c225ae 100644
--- a/tools/get_pr_ut.py
+++ b/tools/get_pr_ut.py
@@ -38,8 +38,8 @@ class PRChecker(object):
         self.github = Github(os.getenv('GITHUB_API_TOKEN'), timeout=60)
         self.repo = self.github.get_repo('PaddlePaddle/Paddle')
         self.py_prog_oneline = re.compile('\d+\|\s*#.*')
-        self.py_prog_multiline_a = re.compile('\d+\|\s*r?""".*?"""', re.DOTALL)
-        self.py_prog_multiline_b = re.compile("\d+\|\s*r?'''.*?'''", re.DOTALL)
+        self.py_prog_multiline_a = re.compile('"""(.*?)"""', re.DOTALL)
+        self.py_prog_multiline_b = re.compile("'''(.*?)'''", re.DOTALL)
         self.cc_prog_online = re.compile('\d+\|\s*//.*')
         self.cc_prog_multiline = re.compile('\d+\|\s*/\*.*?\*/', re.DOTALL)
         self.lineno_prog = re.compile('@@ \-\d+,\d+ \+(\d+),(\d+) @@')