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Issue #22493: Inline flags now should be used only at the start of the

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regular expression.  Deprecation warning is emitted if uses them in the
middle of the regular expression.
This commit is contained in:
Serhiy Storchaka 2016-09-11 12:50:02 +03:00
parent 352601ca00
commit bd48d27944
12 changed files with 58 additions and 34 deletions
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8
Lib/sre_parse.py
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@ -279,6 +279,9 @@ class Tokenizer:
break
result += c
return result
@property
def pos(self):
return self.index - len(self.next or '')
def tell(self):
return self.index - len(self.next or '')
def seek(self, index):
@ -727,8 +730,13 @@ def _parse(source, state, verbose):
state.checklookbehindgroup(condgroup, source)
elif char in FLAGS or char == "-":
# flags
pos = source.pos
flags = _parse_flags(source, state, char)
if flags is None: # global flags
if pos != 3: # "(?x"
import warnings
warnings.warn('Flags not at the start of the expression',
DeprecationWarning, stacklevel=7)
continue
add_flags, del_flags = flags
group = None