ruff: fix re errors

Author: alexfikl

sumpy/codegen.py

@@ -537,7 +537,7 @@ def map_constant(self, expr, rec_self=None):
 
 # {{{ vector component rewriter
 
-INDEXED_VAR_RE = re.compile("^([a-zA-Z_]+)([0-9]+)$")
+INDEXED_VAR_RE = re.compile(r"^([a-zA-Z_]+)([0-9]+)$")
 
 
 class VectorComponentRewriter(CSECachingIdentityMapper, CallExternalRecMapper):

sumpy/version.py

@@ -31,7 +31,7 @@
 def _parse_version(version: str) -> tuple[tuple[int, ...], str]:
     import re
 
-    m = re.match("^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
+    m = re.match(r"^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
     assert m is not None
 
     return tuple(int(nr) for nr in m.group(1).split(".")), m.group(2)