字符串C＃中的正则表达式匹配数

Question

I am trying to get the total price from a receipt with Regex.

The formatting is:

TOTAL     15.40

The goal is only to get the price out of the string.

I started with TOTAL[ .0-9] , but this only returned the word TOTAL .

I googled around and putted this one together but can't get it to work:

TOTAL(\\s+)(?<value>[.0-9]+)

I have made the following code:

sRegex = "TOTAL(\\s+)(?<value>[.0-9]+)";    
Match match = Regex.Match(this.sHTMLResult, sRegex, RegexOptions.None);
if (match.Success)
    Console.Out.WriteLine("regex good");
else
    Console.Out.WriteLine("regex fail");

But the regex doesn't return a success.

I try to get it out of a HTML file formatted like this:

TOTAL     15.40

Answer 1

您可以使用：

"TOTAL *(\\d*.\\d*)"

Answer 2

Your initial regular expression works fine with the supplied text:

TOTAL(\\s+)(?<value>[.0-9]+)

However, as you indicated in comments, this is from HTML and contains the character entities for no break spaces, so you need to account for those as well:

TOTAL(\\s+|(&nbsp;)+)(?<value>[.0-9]+)

Answer 3

您的正则表达式可以正常工作（按照建议检查您的输入），但是它有一个小错误：它将捕获数字和点的任何组合（例如333.3.2.22 ....），更好的方法是：

TOTAL\s+(?<value>\d+\.\d+)

Answer 4

(?(\\b.*\\b\\s)([0-9.]*[0-9])) should work.

I would recommend you to use the Regex hero online editor which is at least really helpful for me.

Answer 5

If you have only a single whitespace between TOTAL and the amount you can use a whitespace in the regex. Additionally, try this:

sRegex = "TOTAL ([0-9]+\.[0-9]+)";

See here for the MSDN reference.