using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"[^[:graph:]*](?#Do not match on any visible character)
\K\*(?#Reset starting point and then match on a *)
([[:alpha:].,\ ]+(?:\*{2}[[:alpha:].,\ ]+\*{2}?\ ?)?)(*COMMIT)
\*\ ?(?#Match on ending * then stop matching with COMMIT)";
string substitution = @"<i>$1</i> ";
string input = @"This text is not italic.
*This text is italic.*
This text is *partially* italic
This text has *two* *italic* bits
**bold text (not italic)**
**bold text with *italic* **
**part bold,** *part italic*
*italic text **with bold** *
*italic* **bold** *italic* **bold**
*invalid markdown (do not parse)**
random * asterisk";
RegexOptions options = RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
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