using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"# Keys are pretty much ""any text before the '=' symbol""
(?P<key>[^=]+)
# Match the '=' symbol
=
(?P<value>
# Lazy match
.*?
# Look-ahead (don't move the ""regex cursor"", just ""peek forward"")
(?=
# Match a '_' that has no other '_' between it and the '=' character, or...
_(?=[^_=\n]+=)
|
# ... or the end of the line
$
)
)
# Actually ""consume"" the '_' character if it exists (or just match the end-of-line)
(?:_|$)";
string substitution = @"\1 = \2\n";
string input = @"str=string_number=12345_device=phone_color=blue
color=aqua_marine_name=matt_number=123_456_879_lastname=blahblah";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace;
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