[issue47163] "unterminated subpattern" in valid regex if re.VERBOSE is used

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue47163] "unterminated subpattern" in valid regex if re.VERBOSE is used

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

"#" in VERBOSE mode starts a comment and skips to the end of the line. Escape 
it: "\#".

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nosy: +serhiy.storchaka
resolution: not a bug -> 
stage: resolved -> 
status: closed -> open

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[issue47163] "unterminated subpattern" in valid regex if re.VERBOSE is used

[Ned Batchelder]

Ned Batchelder  added the comment:

I realized my mistake... never mind!

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stage:  -> resolved
status: open -> closed

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[issue47163] "unterminated subpattern" in valid regex if re.VERBOSE is used

[Ned Batchelder]

New submission from Ned Batchelder :

In this code, the same regex is compiled with and without re.VERBOSE.  Without, 
it compiles fine.  With, it fails with an "unterminated subpattern" error.

list_num_rx1 = r"""(?P\()?(\d+|#|[a-z])(?(paren)\)|\.)"""
list_num_rx2 = r"""(?x)(?P\()?(\d+|#|[a-z])(?(paren)\)|\.)"""

# This works:
re.compile(list_num_rx1)
# Either of these fails:
re.compile(list_num_rx1, flags=re.VERBOSE)
re.compile(list_num_rx2)

(What I really wanted was this, but the error happens without the multiline 
string:)

list_num_rx = r"""(?x)
(?P\()?  # maybe an opening paren
(\d+|#|[a-z])   # the number: 123, or #, or a-z
(?(paren)   # if we had an opening paren..
\)| #   then we need a closing paren
\.  #   otherwise a dot.
)
"""

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components: Regular Expressions
messages: 416340
nosy: ezio.melotti, mrabarnett, nedbat
priority: normal
severity: normal
status: open
title: "unterminated subpattern" in valid regex if re.VERBOSE is used

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