正则表达式删除前导号码

Question

输入应该是这样的：

123 - string I want - with dash included

或

123 - string I want

或

string I want - with dash included

或

string I want

什么是正则表达式string I want - with dash included或string I want，我希望删除前导数字部分“123 - ”如果输入以数字开头，则不删除其他数字。

Answer 1

您可以使用以下内容。

string input  = "123 - string I want - with dash included";
string output = Regex.Replace(input, @"^\d+\W+", "");

// => "string I want - with dash included"

正则表达式

^             # the beginning of the string
\d+           # digits (0-9) (1 or more times)
\W+           # non-word characters (all but a-z, A-Z, 0-9, _) (1 or more times)

另一种选择是使用可选的分组和捕获组并进行替换。

string input  = "123 - string I want - with dash included";
string output = Regex.Replace(input, @"^(\d+\W+)?(.*)$", "$2");

// => "string I want - with dash included"