用正则表达式拆分

Question

I want to split strings similar to abc123 , abcdefgh12 or a123456 into letters and numbers, so that the result will be {"abc", "123"} etc.

What is the simplest way to do it in C# 4.0? I want to do it with one regex.

Answer 1

Why regex?

    static readonly char[] digits = {'0','1','2','3','4','5','6','7','8','9'};
    ....
    string s = "abcdefgh12", x = s, y = "";
    int i = s.IndexOfAny(digits);
    if (i >= 0) {
        x = s.Substring(0, i);
        y = s.Substring(i, s.Length - i);
    }

Answer 2

"Only numbers or only letters" can be represented using [a-zA-Z]*|[0-9]* . All you have to do is look for all matches of that regular expression in your string. Note that non-alphanumeric characters will not be returned, but will still split the strings (so "123-456" would yield { "123", "456"} ).

EDIT : I've interpreted your question as stating that your strings can be a sequence of letters and numbers in any order - if your string is merely one or more letters followed by one or more numbers, a regular expression is unnecessary: look for the first digit and split the string.

Answer 3

In addition to Marc Gravell, read http://www.codinghorror.com/blog/2008/06/regular-expressions-now-you-have-two-problems.html .

What is the simplest way to do it in C# 4.0? I want to do it with one regex.

That's practically an oxymoron in your case. The simplest way of splitting by a fixed pattern is not with regexes.

Answer 4

splitArray = Regex.Split(myString, @"(?<=\p{L})(?=\p{N})");

正则表达式拆分字符串和数字

Answer 5

除非我缺少任何东西，否则应该可以解决... ([az]*)([0-9]*)

Answer 6

You could create a group for letteres and one for numbers. use this guide for further info: http://www.regular-expressions.info/reference.html HTH!