例如,可以使用正则表达式来匹配“2009年2月”吗?
沿线
\b(?:Jan(?:uary)?|Feb(?:ruary)?|...|Dec(?:ember)?) (?:19[7-9]\d|2\d{3})(?=\D|$)
那是
\b # a word boundary (?: # non-capturing group Jan(?:uary)? # Jan(uary) |Feb(?:ruary)? # |... # and so on |Dec(?:ember)? # Dec(ember) ) # end group # a space (?: # non-capturing group 19[7-9]\d|2\d{3} # 1970-2999 ) # end group (?=\D|$) # followed by: anything but a digit or the end of string
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