用于字符串匹配的正则表达式

Question

在C#的以下字符串中，什么是匹配单词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

关于

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

• (CALL)查找字符串并将其放入匹配组

• \b part再次检查单词边界。

Answer 2

它会是

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

Answer 3

也可以使用

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

而不是使用CALL|call。这样，您还可以匹配"CALl“或"cAll”。(当然，如果需要的话)。