I have a date which returns either "23-12-2010" or '2013-' I want to extract the valid year for 2013- ie. 2013 and valid date for 23-12-1010 i.e 23-12-2010. So I am trying to extract all the tring before last '-' if it is present.I have a date which returns either "23-12-2010"
阅读背景：
在字符结束前匹配任何字符串
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