tools: fix regex strings in Python tools

PR-URL: #46671
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

tools/getsharedopensslhasquic.py

@@ -14,7 +14,7 @@ def get_has_quic(include_path):
     except OSError:
       return False
 
-    regex = '^#\s*define OPENSSL_INFO_QUIC'
+    regex = r'^#\s*define OPENSSL_INFO_QUIC'
 
     for line in f:
       if (re.match(regex, line)):

tools/js2c.py

@@ -86,7 +86,7 @@ def ReadFile(filename):
 
 CONFIG_GYPI_ID = 'config_raw'
 
-SLUGGER_RE =re.compile('[.\-/]')
+SLUGGER_RE = re.compile(r'[.\-/]')
 
 is_verbose = False
 

tools/v8_gypfiles/GN-scraper.py

@@ -3,7 +3,7 @@
 import re
 import os
 
-PLAIN_SOURCE_RE = re.compile('\s*"([^/$].+)"\s*')
+PLAIN_SOURCE_RE = re.compile(r'\s*"([^/$].+)"\s*')
 def DoMain(args):
   gn_filename, pattern = args
   src_root = os.path.dirname(gn_filename)