I tried to replace elements in a string using .NET regex - with no luck :)
Assume the following string:
AA A C D A Some Text here
The rules
The desired result from above is (# as replacement character):
AA#A C#D A#Some Text here
This should cover all 3 of your requirements. Excuse the formatting; I had to back-tick the first few lines for the to show up properly.
string pattern = @"(?<!^| )((?<!\s) (?!\s))(?!\1)";
string[] inputs = { " AA A C D A Some Text here", // original
" AA A C D A Some Text here" // space before/after
};
foreach (string input in inputs)
{
string result = Regex.Replace(input, pattern, "#");
Console.WriteLine("Original: {0}\nResult: {1}", input, result);
}
Output:
Original: AA A C D A Some Text here
Result: AA#A C#D A#Some Text here
Original: AA A C D A Some Text here
Result: AA#A C#D A Some Text here
I am not familiar with C#'s particular regex flavor but in PERL/PHP style this works for me:
s/(?<!\A| | ) (?! | )/#/g
This relies on negative lookbehind, negative lookahead and the \A = start of input escape sequence.
You should try the following example :
string s = Regex.Replace(original, "(?<!( | |^)) (?!( | ))", "#");
(?<! | |^) (?! | )You may use this one
[^^\s(nbsp;)](nbsp;)[^$\s(nbsp;)]
