[英]Using regular expression (Regex) to strip characters based on length of input string
I wish to use .NET Regex to create a regular expression that takes an input string and outputs a string with characters removed from the front, but the number of characters removed depends on the length of the input string. 我希望使用.NET Regex创建一个正则表达式,该正则表达式接受输入字符串并输出从前面删除了字符的字符串,但是删除的字符数取决于输入字符串的长度。
The input string can be either: 输入字符串可以是:
'N' is always numeric and '123' can be any number combination. “ N”始终是数字,“ 123”可以是任何数字组合。 The '0' in the first two cases is always '0' and 'ROC' is always 'ROC'. 前两种情况下的“ 0”始终为“ 0”,“ ROC”始终为“ ROC”。
In each case, I just want to return the 'N' part. 在每种情况下,我只想返回“ N”部分。 ie: 即:
Thanks! 谢谢!
我假设“ 123”部分始终为3位数字,请尝试以下操作:
string value = Regex.Match(input, @"^ROC(\d{3}0)?(\d+)$").Groups[2].Value;
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