C＃正则表达式正则表达式可匹配最后一组中的字符，但不能匹配空组

Question

Please can any one advise me of a solution that will allow my regular expression to match the following data lines...

0002,Area (Region Name),No value
0003,Area (Region Name),Up North

...but should fail on this line (due to the empty last group)

0001,Area (Region Name),

My current expression is:

(?<BRANCH_CODE>[a-zA-Z0-9]{1,8}),(?<UDA_NAME>[a-zA-Z0-9!"\£\$\%\^\&\*\(\)\-+_ /]{1,50}),(?<UDA_VALUE>[a-zA-Z0-9!"\£\$\%\^\&\*\(\)\-+_ /]{1,50})

... which works fine in Expresso, but NOT in my C# code!

Any help appreciated. Thank you.

Reference that has not helped: Regular expression matches an extra empty group

Answer 1

转义所有双引号。

@"(?<BRANCH_CODE>[a-zA-Z0-9]{1,8}),(?<UDA_NAME>[a-zA-Z0-9!""\£\$\%\^\&\*\(\)\-+_ /]{1,50}),(?<UDA_VALUE>[a-zA-Z0-9!""\£\$\%\^\&\*\(\)\-+_ /]{1,50})"

Answer 2

该表达式看起来正确，但是我将确保您的表达式上有一个开始和结束字符，否则它可能在字符串中匹配。

^(?<BRANCH_CODE>[a-zA-Z0-9]{1,8}),(?<UDA_NAME>[a-zA-Z0-9!"\£\$\%\^\&\*\(\)\-+_ /]{1,50}),(?<UDA_VALUE>[a-zA-Z0-9!"\£\$\%\^\&\*\(\)\-+_ /]{1,50})$