diff options
Diffstat (limited to 'Lib/sre_parse.py')
| -rw-r--r-- | Lib/sre_parse.py | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py index d78737f..07ab782 100644 --- a/Lib/sre_parse.py +++ b/Lib/sre_parse.py @@ -482,9 +482,15 @@ def _parse(source, state): if source.next is None or source.next == ")": break source.get() - elif source.next in ("=", "!"): + elif source.next in ("=", "!", "<"): # lookahead assertions char = source.get() + dir = 1 + if char == "<": + if source.next not in ("=", "!"): + raise error, "syntax error" + dir = -1 # lookbehind + char = source.get() b = [] while 1: p = _parse(source, state) @@ -493,9 +499,9 @@ def _parse(source, state): b.append(p) p = _branch(state, b) if char == "=": - subpattern.append((ASSERT, p)) + subpattern.append((ASSERT, (dir, p))) else: - subpattern.append((ASSERT_NOT, p)) + subpattern.append((ASSERT_NOT, (dir, p))) break elif source.match("|"): b.append(p) |