using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?<prefix>{[^\\}]++)(?<first_lvl_command>\\\w+(?:\[[^]]++]?({(?:[^{}]+|(?3))*+}))({(?:[^{}]+|(?3))*+})?)(?<closing_bracket>})";
string substitution = @"$prefix {$first_lvl_command$closing_bracket}";
string input = @"\rpl{text}{ some\com1[opts]{ some \qtyrange{100}{200}{\celsius} and }{something else \gls{abc} $1=1$ not \colortext{\red}{\underline{text}}}} but this is already braced {\qtyrange{100}{200}{\celsius}}}
";
RegexOptions options = 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