osc2_scenario: Fix SyntaxWarnings (carla-simulator#1122)

This fixes warnings like the one below:

    .../srunner/scenarios/osc2_scenario.py:515: SyntaxWarning: invalid escape sequence '\W'
    expression_value = re.split("\W+", option)

Co-authored-by: glopezdiest <[email protected]>

Author: 2 people

Docs/CHANGELOG.md

@@ -15,6 +15,7 @@
 ## Upcoming
 * Improvements to the CarlaDataProvider:
  - Added `spawn_actor` for a blueprint based actor creation similar to `World.spawn_actor`
+* Removed SyntaxWarnings in osc2_scenario.py
 * Implement `strtobool` formerly included in `distutils`, which is removed in Python 3.12.
 
 ## CARLA ScenarioRunner 0.9.15

srunner/scenarios/osc2_scenario.py

@@ -512,8 +512,8 @@ def visit_do_directive(self, node: ast_node.DoDirective):
 
         def bool_result(self, option):
             # wait(x < y) @drive_distance Handling of Boolean expressions x < y
-            expression_value = re.split("\W+", option)
-            symbol = re.search("\W+", option).group()
+            expression_value = re.split(r"\W+", option)
+            symbol = re.search(r"\W+", option).group()
             if symbol == "<":
                 symbol = operator.lt
             elif symbol == ">":
@@ -1194,10 +1194,10 @@ def visit_identifier_reference(self, node: ast_node.IdentifierReference):
                 if isinstance(para_value, (Physical, float, int)):
                     return para_value
                 para_value = para_value.strip('"')
-                if re.fullmatch("(^[-]?[0-9]+(\.[0-9]+)?)\s*(\w+)", para_value):
+                if re.fullmatch(r"(^[-]?[0-9]+(\.[0-9]+)?)\s*(\w+)", para_value):
                     # Regular expression ^[-]?[0-9]+(\.[0-9]+)? matching float
                     # para_value_num = re.findall('^[-]?[0-9]+(\.[0-9]+)?', para_value)[0]
-                    patter = re.compile("(^[-]?[0-9]+[\.[0-9]+]?)\s*(\w+)")
+                    patter = re.compile(r"(^[-]?[0-9]+[\.[0-9]+]?)\s*(\w+)")
                     para_value_num, para_value_unit = patter.match(para_value).groups()
                     if para_value_num.count(".") == 1:
                         return Physical(