用于匹配字符串的正则表达式

Question

什么是匹配C＃中以下字符串中的单词call或CALL的正则表达式？

NIFTY-CALL-1200-Aug11
NIFTY CALL 1200 Aug11
NIFTYCALL-CALL-1200-Aug11 //In this case second call word must be matched not NIFTYCALL.
NIFTYCALL CALL 1200 Aug11 //In this case second call word must be matched not NIFTYCALL.
CALLNIFTY CALL 1200 Aug11 //In this case second call word must be matched not CALLNIFTY.
CALLNIFTY CALL 1200 Aug11 //In this case second call word must be matched not CALLNIFTY.
CALLNIFTY Aug11 1200CALL //In this case last call word must be matched not CALLNIFTY.
CALLNIFTY 1200 Aug11CALL //In this case last call word must be matched not CALLNIFTY.

Answer 1

怎么样？

Regex regexObj = new Regex(@"(?:\b|[0-9])(CALL)\b", RegexOptions.Singleline);

• (?:<b|[0-9])部分检查字边界或CALL之前的数字

• （CALL）找到字符串并将其放入匹配的组中

• \b部分再次检查单词边界。

Answer 2

这将是

Regex re = new Regex(@"(\d|\b)(CALL|call)(\d|\b)");

Answer 3

还可以使用

Regex re = new Regex(@"(\d|\b)(CALL)(\d|\b)",RegexOptions.IgnoreCase);

而不是使用CALL |调用。这样，你也匹配“cAll”或“CALl”。 （如果需要的话）。