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refac: build the SQLite LIKE regex from wildcard-split segments (#30393)

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Each '%'-separated segment of the LIKE pattern is now matched with an atomic group.
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Classic298 2026-09-24 05:55:57 +02:00 • committed by GitHub
parent e14f245586
commit d9dff09c30
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1 changed files with 10 additions and 5 deletions
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15
backend/open_webui/internal/db.py
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@ -348,15 +348,16 @@ elif 'sqlite' in SQLALCHEMY_DATABASE_URL:
if compiled is False:
return False
if compiled is None:
regex = []
segments = ['']
escaped = False
for char in pattern:
if escape and not escaped and char == escape:
escaped = True
continue
regex.append(
'.*' if not escaped and char == '%' else '.' if not escaped and char == '_' else re.escape(char)
)
if not escaped and char == '%':
segments.append('')
else:
segments[-1] += '.' if not escaped and char == '_' else re.escape(char)
escaped = False
if escaped:
compiled = False
@ -364,7 +365,11 @@ elif 'sqlite' in SQLALCHEMY_DATABASE_URL:
compiled_patterns.clear()
compiled_patterns[key] = compiled
return False
compiled = re.compile(''.join(regex), re.DOTALL)
# Atomic groups pin each middle segment to its first match, so '%' never backtracks.
regex = segments[0] + ''.join(f'(?>.*?{segment})' for segment in segments[1:-1])
if len(segments) > 1:
regex += '.*' + segments[-1]
compiled = re.compile(regex, re.DOTALL)
if len(compiled_patterns) >= 512:
compiled_patterns.clear()
compiled_patterns[key] = compiled