add regex and excludes

game_backuper/regexp.py

@@ -0,0 +1,51 @@
+try:
+    from game_backuper._pcre2 import PCRE2, Option as PCRE2Option, MatchOption
+    have_pcre2 = True
+except ImportError:
+    have_pcre2 = False
+from enum import IntFlag
+from re import I as REI, compile as re_comp
+
+
+class RegexFlag(IntFlag):
+    I = 1  # noqa: E741
+    IGNORECASE = 1
+
+
+class Regex:
+    def __init__(self, r: str, flags: RegexFlag = 0, use_pcre2: bool = False):
+        if have_pcre2 and use_pcre2:
+            opt = 0
+            if flags & RegexFlag.I:
+                opt = opt | PCRE2Option.PCRE2_CASELESS
+            self._re = PCRE2(r)
+            self._use_pcre2 = True
+        else:
+            if use_pcre2:
+                from sys import stderr
+                stderr.write("Can not load pcre2.\n")
+            self._use_pcre2 = False
+            opt = 0
+            if flags & RegexFlag.I:
+                opt = opt | REI
+            self._re = re_comp(r)
+
+    def match(self, s: str, startpos: int = 0):
+        if self._use_pcre2:
+            return self._re.match(s, MatchOption.PCRE2_ANCHORED, startpos)
+        else:
+            return self._re.match(s, startpos)
+
+    def match_only(self, s: str, startpos: int = 0) -> bool:
+        if self._use_pcre2:
+            return self._re.match(s, MatchOption.PCRE2_ANCHORED, startpos, True)  # noqa: E501
+        else:
+            return False if self._re.match(s, startpos) is None else True
+
+
+def wildcards_to_regex(s: str, **k):
+    for i in ['\\', '$', '(', ')', '+', '.', '[', '^', '{', '|']:
+        s = s.replace(i, f"\\{i}")
+    s = s.replace("*", ".*")
+    s = s.replace("?", ".")
+    return Regex(s, **k)