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Make _strptime escape regex syntax in format string to prevent use in internal regex.

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This commit is contained in:
Brett Cannon 2003-04-19 04:00:56 +00:00
parent 482c5f7eb7
commit 1e91d8eb03
2 changed files with 24 additions and 1 deletions
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11
Lib/_strptime.py
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@ -373,8 +373,17 @@ class TimeRE(dict):
return '%s)' % regex
def pattern(self, format):
"""Return re pattern for the format string."""
"""Return re pattern for the format string.
Need to make sure that any characters that might be interpreted as
regex syntax is escaped.
"""
processed_format = ''
# The sub() call escapes all characters that might be misconstrued
# as regex syntax.
regex_chars = re_compile(r"([\\.^$*+?{}\[\]|])")
format = regex_chars.sub(r"\\\1", format)
whitespace_replacement = re_compile('\s+')
format = whitespace_replacement.sub('\s*', format)
while format.find('%') != -1: