如何分割不一致的字符串的一部分？

Question

I have the following string:

01-21-27-0000-00-048 and it is easy to split it apart because each section is separated by a - , but sometimes this string is represented as 01-21-27-0000-00048 , so splitting it is not as easy because the last 2 parts are combined. How can I handle this? Also, what about the case where it might be something like 01-21-27-0000-00.048

In case anyone is curious, this is a parcel number and it varies from county to county and a county can have 1 format or they can have 100 formats.

Answer 1

This is a very good case for using regular expressions. You string matches the following regexp:

(\d{2})-(\d{2})-(\d{2})-(\d{4})-(\d{2})[.-]?(\d{3})

Match the input against this expression, and harvest the six groups of digits from the match:

var str = new[] {
    "01-21-27-0000-00048", "01-21-27-0000-00.048", "01-21-27-0000-00-048"
};
foreach (var s in str) {
    var m = Regex.Match(s, @"(\d{2})-(\d{2})-(\d{2})-(\d{4})-(\d{2})[.-]?(\d{3})");
    for (var i = 1 /* one, not zero */ ; i != m.Groups.Count ; i++) {
        Console.Write("{0} ", m.Groups[i]);
    }
    Console.WriteLine();
}

If you would like to allow for other characters, say, letters in the segments that are separated by dashes, you could use \\w instead of \\d to denote a letter, a digit, or an underscore. If you would like to allow an unspecified number of such characters within a known range, say, two to four, you can use {2,4} in the regexp instead of the more specific {2} , which means "exactly two". For example,

(\w{2,3})-(\w{2})-(\w{2})-(\d{4})-(\d{2})[.-]?(\d{3})

lets the first segment contain two to three digits or letters, and also allow for letters in segments two and three.

Answer 2

Normalize the string first.

Ie if you know that the last part is always three characters, then insert a - as the fourth-to-last character, then split the resultant string. Along the same line, convert the dot '.' to a dash '-' and split that string.

Answer 3

Replace all the char which are not digit with emptyString ('').

then any of your string become in the format like

012127000000048

now you can use the divide it in (2, 2, 2, 4, 2, 3) parts.