[issue26475] Misleading debugging output for verbose regular expressions

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

When the verbose mode is switched on by using the inline (?x) flag instead of re.VERBOSE argument, the debugging output is duplicated: once for non-verbose mode and then for verbose mode.

>>> import re
>>> re.compile(r' (?x)a', re.DEBUG)
LITERAL 32
LITERAL 97
LITERAL 97
re.compile(' (?x)a', re.VERBOSE|re.DEBUG)

Proposed patch makes the parser to produce only final output for verbose mode.

>>> re.compile(r' (?x)a', re.DEBUG)
LITERAL 97
re.compile(' (?x)a', re.VERBOSE|re.DEBUG)

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assignee: serhiy.storchaka
components: Regular Expressions
files: re_verbose_debug.patch
keywords: patch
messages: 261148
nosy: ezio.melotti, mrabarnett, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Misleading debugging output for verbose regular expressions
type: behavior
versions: Python 2.7, Python 3.5, Python 3.6
Added file: http://bugs.python.org/file42066/re_verbose_debug.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26475>
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