Copy over the code and tests, to see if this even works

src/documents/plugins/date_parsing/regex_parser.py

@@ -0,0 +1,66 @@
+import datetime
+import re
+from collections.abc import Iterator
+from pathlib import Path
+from re import Match
+
+from documents.plugins.date_parsing.base import DateParserPluginBase
+
+
+class RegexDateParserPlugin(DateParserPluginBase):
+    """
+    The default date parser, using a series of regular expressions.
+
+    It is configured entirely by the DateParserConfig object
+    passed to its constructor.
+    """
+
+    DATE_REGEX = re.compile(
+        r"(\b|(?!=([_-])))(\d{1,2})[\.\/-](\d{1,2})[\.\/-](\d{4}|\d{2})(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))(\d{4}|\d{2})[\.\/-](\d{1,2})[\.\/-](\d{1,2})(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))(\d{1,2}[\. ]+[a-zéûäëčžúřěáíóńźçŞğü]{3,9} \d{4}|[a-zéûäëčžúřěáíóńźçŞğü]{3,9} \d{1,2}, \d{4})(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))([^\W\d_]{3,9} \d{1,2}, (\d{4}))(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))([^\W\d_]{3,9} \d{4})(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))(\d{1,2}[^ 0-9]{2}[\. ]+[^ ]{3,9}[ \.\/-]\d{4})(\b|(?=([_-])))|"
+        r"(\b|(?!=([_-])))(\b\d{1,2}[ \.\/-][a-zéûäëčžúřěáíóńźçŞğü]{3}[ \.\/-]\d{4})(\b|(?=([_-])))",
+        re.IGNORECASE,
+    )
+
+    def _process_match(
+        self,
+        match: Match[str],
+        date_order: str,
+    ) -> datetime.datetime | None:
+        """
+        Processes a single regex match using the base class helpers.
+        """
+        date_string = match.group(0)
+        date = self._parse_string(date_string, date_order)
+        return self._filter_date(date)
+
+    def _process_content(
+        self,
+        content: str,
+        date_order: str,
+    ) -> Iterator[datetime.datetime]:
+        """
+        Finds all regex matches in content and yields valid dates.
+        """
+        for m in re.finditer(self.DATE_REGEX, content):
+            date = self._process_match(m, date_order)
+            if date is not None:
+                yield date
+
+    def parse(self, filename: Path, content: str) -> Iterator[datetime.datetime]:
+        """
+        Implementation of the abstract parse method.
+
+        Reads its configuration from `self.config`.
+        """
+        if self.config.filename_date_order:
+            yield from self._process_content(
+                filename.name,
+                self.config.filename_date_order,
+            )
+
+        yield from self._process_content(content, self.config.content_date_order)