using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:\t| )*(?:#|%|;|//|--|REM|C|!) (?:#{64} (.*)|#{32} (.*)|#{16} (.*)|#{8} (.*)|#{4} (.*)|#{2} (.*))$";
string input = @"Valid comments that start with ""#"":
# ################################################################ First Level
# ################################ Second Level
# ################ Third level
# ######## Fourth Level
# #### Fifth level
# ## Sixth level
Valid comments that start with different characters:
// ################################################################ 1st Level
; ################################ 2nd Level
REM ################ 3rd level
C ######## 4th Level
% #### 5th level
-- ## 6th level
Valid comments that start with spaces or tabs:
# ################################################################ 1st level
; ################################ 2nd Level
Invalid comments:
################################################################ No initial character
; ################################################ Hashes not a power of 2
@ ################ Character not recognized
C ########No space after hashes
% %%%%%%%% No hashes
. # #### Period before spaces
;#### No space after character";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx