.net 中的正则表达式以 2 个特定字符开头，以数字结尾，并以一定长度

Question

Ok Reg ex 专家，我不太擅长正则表达式，希望能得到一些帮助。我有一个正则表达式，我一生都无法弄清楚。我希望创建一个匹配以下内容的正则表达式：

以“PA”开头（ingore 大小写）

以数字结尾

长度为 8 个字符（忽略任何尾随空格）

或

以“WN”开头（ingore 大小写）

以数字结尾

长度为 10 个字符（忽略任何尾随空格）

Answer 1

//Trim the whitespace off the ends of your string per requirement
yourString = yourString.Trim();
//Declare regex, the pattern tells it to look for any 7 letter word
//which starts with PA and ends with a digit and is 7 characters long
//OR a word which starts with WN and ends with a digit and is 10 characters long. 
Regex regex = new Regex(^PA.+\d${7})|(^WN.+\d${10});
//Set the regex option to ignore case
RegexOptions options = RegexOptions.IgnoreCase;
//Get the match collection by passing your string, the regex pattern and
//the regex options
MatchCollection matches = regex.Matches(yourString, regex, options);

//Do something with captured text