Add util methods for comparing strings

Author: haacked

posthog/feature_flags.py

@@ -7,6 +7,7 @@
 from dateutil import parser
 from dateutil.relativedelta import relativedelta
 
+from posthog import utils
 from posthog.utils import convert_to_datetime_aware, is_valid_regex
 
 __LONG_SCALE__ = float(0xFFFFFFFFFFFFFFF)
@@ -130,7 +131,7 @@ def match_property(property, property_values) -> bool:
         def compute_exact_match(value, override_value):
             if isinstance(value, list):
                 return str(override_value).casefold() in [str(val).casefold() for val in value]
-            return str(value).casefold() == str(override_value).casefold()
+            return utils.str_icontains(value, override_value)
 
         if operator == "exact":
             return compute_exact_match(value, override_value)
@@ -141,10 +142,10 @@ def compute_exact_match(value, override_value):
         return key in property_values
 
     if operator == "icontains":
-        return str(value).casefold() in str(override_value).casefold()
+        return utils.str_icontains(override_value, value)
 
     if operator == "not_icontains":
-        return str(value).casefold() not in str(override_value).casefold()
+        return not utils.str_icontains(override_value, value)
 
     if operator == "regex":
         return is_valid_regex(str(value)) and re.compile(str(value)).search(str(override_value)) is not None

posthog/utils.py

@@ -125,3 +125,43 @@ def convert_to_datetime_aware(date_obj):
     if date_obj.tzinfo is None:
         date_obj = date_obj.replace(tzinfo=timezone.utc)
     return date_obj
+
+
+def str_icontains(source, search):
+    """
+    Check if a string contains another string, ignoring case.
+
+    Args:
+        source: The string to search within
+        search: The substring to search for
+
+    Returns:
+        bool: True if search is a substring of source (case-insensitive), False otherwise
+
+    Examples:
+        >>> str_icontains("Hello World", "WORLD")
+        True
+        >>> str_icontains("Hello World", "python")
+        False
+    """
+    return str(search).casefold() in str(source).casefold()
+
+
+def str_iequals(value, comparand):
+    """
+    Check if a string equals another string, ignoring case.
+
+    Args:
+        value: The string to compare
+        comparand: The string to compare with
+
+    Returns:
+        bool: True if value and comparand are equal (case-insensitive), False otherwise
+
+    Examples:
+        >>> str_iequals("Hello World", "hello world")
+        True
+        >>> str_iequals("Hello World", "hello")
+        False
+    """
+    return str(value).casefold() == str(comparand).casefold()