Allow regexes for URL expiration patterns

This allows for more fine-grained control over URL patterns than
globbing in the rare cases where that is needed.

3 files changed, 22 insertions, 9 deletions

diff --git a/requests_cache/policy/__init__.py b/requests_cache/policy/__init__.py
index dbd5bab..48b384a 100644
--- a/requests_cache/policy/__init__.py
+++ b/requests_cache/policy/__init__.py
@@ -4,12 +4,16 @@ additional settings and features specific to requests-cache.
 # flake8: noqa: E402,F401
 # isort: skip_file
 from datetime import datetime, timedelta
-from typing import Callable, Dict, Union, MutableMapping
+from typing import Callable, Dict, Pattern as RegexPattern, Union, MutableMapping
 
 from requests import Response
 
 ExpirationTime = Union[None, int, float, str, datetime, timedelta]
-ExpirationPatterns = Dict[str, ExpirationTime]
+ExpirationPattern = Union[  # Either a glob expression as str or a compiled regex pattern
+    str,
+    RegexPattern,
+]
+ExpirationPatterns = Dict[ExpirationPattern, ExpirationTime]
 FilterCallback = Callable[[Response], bool]
 KeyCallback = Callable[..., str]
 HeaderDict = MutableMapping[str, str]
diff --git a/requests_cache/policy/expiration.py b/requests_cache/policy/expiration.py
index 1041e36..1350951 100644
--- a/requests_cache/policy/expiration.py
+++ b/requests_cache/policy/expiration.py
@@ -5,9 +5,10 @@ from fnmatch import fnmatch
 from logging import getLogger
 from math import ceil
 from typing import Optional
+from typing import Pattern as RegexPattern
 
 from .._utils import try_int
-from . import ExpirationPatterns, ExpirationTime
+from . import ExpirationPattern, ExpirationPatterns, ExpirationTime
 
 # Special expiration values that may be set by either headers or keyword args
 DO_NOT_CACHE = 0x0D0E0200020704  # Per RFC 4824
@@ -89,7 +90,7 @@ def _to_utc(dt: datetime):
     return dt
 
 
-def _url_match(url: str, pattern: str) -> bool:
+def _url_match(url: str, pattern: ExpirationPattern) -> bool:
     """Determine if a URL matches a pattern
 
     Args:
@@ -103,7 +104,15 @@ def _url_match(url: str, pattern: str) -> bool:
         True
         >>> url_match('https://httpbin.org/stream/2', 'httpbin.org/*/1')
         False
+        >>> url_match('https://httpbin.org/stream/2', re.compile('httpbin.org/*/\\d+'))
+        True
+        >>> url_match('https://httpbin.org/stream/x', re.compile('httpbin.org/*/\\d+'))
+        False
     """
-    url = url.split('://')[-1]
-    pattern = pattern.split('://')[-1].rstrip('*') + '**'
-    return fnmatch(url, pattern)
+    if isinstance(pattern, RegexPattern):
+        match = pattern.search(url)
+        return match is not None
+    else:
+        url = url.split('://')[-1]
+        pattern = pattern.split('://')[-1].rstrip('*') + '**'
+        return fnmatch(url, pattern)
diff --git a/requests_cache/policy/settings.py b/requests_cache/policy/settings.py
index 8e8e26b..7c4dce8 100644
--- a/requests_cache/policy/settings.py
+++ b/requests_cache/policy/settings.py
@@ -4,7 +4,7 @@ from attr import define, field
 
 from .._utils import get_valid_kwargs
 from ..models import RichMixin
-from . import ExpirationTime, FilterCallback, KeyCallback
+from . import ExpirationPattern, ExpirationTime, FilterCallback, KeyCallback
 
 ALL_METHODS = ('GET', 'HEAD', 'OPTIONS', 'POST', 'PUT', 'PATCH', 'DELETE')
 DEFAULT_CACHE_NAME = 'http_cache'
@@ -36,7 +36,7 @@ class CacheSettings(RichMixin):
     only_if_cached: bool = field(default=False)
     stale_if_error: Union[bool, ExpirationTime] = field(default=False)
     stale_while_revalidate: Union[bool, ExpirationTime] = field(default=False)
-    urls_expire_after: Dict[str, ExpirationTime] = field(factory=dict)
+    urls_expire_after: Dict[ExpirationPattern, ExpirationTime] = field(factory=dict)
 
     @classmethod
     def from_kwargs(cls, **kwargs):