Python regex错误字符范围。
Python regex错误字符范围。
提问于 2015-02-16 18:25:06
我使用以下正则表达式来匹配不同的日期模式。它在regex101.com中运行良好。但是当我导入到python时，我得到了“坏字符范围”异常。
pattern = ur"((?:\b((?:(january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)['\s\.]{0,4}(?:\d{4}|\d{2})|(?:january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)|((?:0[1-9]|[1-3][0-9]|[0-9])/(?:0[1-9]|[1-3][0-9])/(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9]))|((?:0[1-9]|1[0-2]|[1-9])\s{0,3}[-/']{1,3}[\s-/']{0,3}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))))(?:(?![\r\n])\s){0,4})[-/–to]{0,2}(?:(?![\r\n])\s){0,4}(((?:january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)[-'\s\.]{0,4}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))|((?:0[1-9]|[1-3][0-9]|[1-9])/(?:0[1-9]|[1-3][0-9])/(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))|((?:0[1-9]|1[0-2]|[1-9])\s{0,3}[-/']{1,3}[\s-/']{0,3}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9]))))))"
https://regex101.com/r/rU3cE9/1回答 1
Stack Overflow用户
回答已采纳
发布于 2015-02-16 18:35:50
问题主要是因为Python字符类中存在连字符，因此[\s-/']将其解释为字符间隔(就像在[a-z]中一样)。我建议您将连字符放在字符类[-\s/']内的第一个或最后一个位置，或者对其进行转义，以防止歧义。
>>> reg = re.compile(ur"((?:\b((?:(january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)['\s\.]{0,4}(?:\d{4}|\d{2})|(?:january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)|((?:0[1-9]|[1-3][0-9]|[0-9])/(?:0[1-9]|[1-3][0-9])/(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9]))|((?:0[1-9]|1[0-2]|[1-9])\s{0,3}[-/']{1,3}[-\s/']{0,3}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))))(?:(?![\r\n])\s){0,4})[-/to–]{0,2}(?:(?![\r\n])\s){0,4}(((?:january|jan|february|feb|march|mar|april|apr|may|jun|june|july|jul|august|aug|september|set|sep|october|oct|november|nov|december|dec)[-'\s\.]{0,4}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))|((?:0[1-9]|[1-3][0-9]|[1-9])/(?:0[1-9]|[1-3][0-9])/(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9])))|((?:0[1-9]|1[0-2]|[1-9])\s{0,3}[-/']{1,3}[-\s/']{0,3}(?:(19[7-9][0-9])|(20[0-1][0-9])|([7-9][0-9]|[0-1][0-9]))))))")
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原文链接：
https://stackoverflow.com/questions/28539253
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