diff options
Diffstat (limited to 'Lib/sre_parse.py')
| -rw-r--r-- | Lib/sre_parse.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py index a6f3082a44..d3dbe00041 100644 --- a/Lib/sre_parse.py +++ b/Lib/sre_parse.py @@ -470,6 +470,25 @@ def _parse(source, state, flags=0): if source.next is None or source.next == ")": break source.get() + elif source.next in ("=", "!"): + # lookahead assertions + char = source.get() + b = [] + while 1: + p = _parse(source, state, flags) + if source.next == ")": + if b: + b.append(p) + p = _branch(state, b) + if char == "=": + subpattern.append((ASSERT, p)) + else: + subpattern.append((ASSERT_NOT, p)) + break + elif source.match("|"): + b.append(p) + else: + raise error, "pattern not properly closed" else: # flags while FLAGS.has_key(source.next): |