Question

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Regular expression, split string by capital letter but ignore TLA

I have a string which is a combination of several words, each word is capitalized.
For example: SeveralWordsString

Using C#, how do I split the string into “Several Words String” in a smart way?

Thanks!

Answer 1

Use this regex (I forgot from which stackoverflow answer I sourced it, will search it now):

 public static string ToLowercaseNamingConvention(this string s, bool toLowercase)
        {
            if (toLowercase)
            {
                var r = new Regex(@"
                (?<=[A-Z])(?=[A-Z][a-z]) |
                 (?<=[^A-Z])(?=[A-Z]) |
                 (?<=[A-Za-z])(?=[^A-Za-z])", RegexOptions.IgnorePatternWhitespace);

                return r.Replace(s, "_").ToLower();
            }
            else
                return s;
        }

I use it in this project: http://www.ienablemuch.com/2010/12/intelligent-brownfield-mapping-system.html

[EDIT]

I found it now: How do I convert CamelCase into human-readable names in Java?

Nicely split “TodayILiveInTheUSAWithSimon”, no space on front of ” Today”:

using System;
using System.Text.RegularExpressions;

namespace TestSplit
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            Console.WriteLine ("Hello World!");



            var r = new Regex(@"
                (?<=[A-Z])(?=[A-Z][a-z]) |
                 (?<=[^A-Z])(?=[A-Z]) |
                 (?<=[A-Za-z])(?=[^A-Za-z])", RegexOptions.IgnorePatternWhitespace);


            string s = "TodayILiveInTheUSAWithSimon";
            Console.WriteLine( "YYY{0}ZZZ", r.Replace(s, " "));
        }
    }
}

Output:

 YYYToday I Live In The USA With SimonZZZ