using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^ # Start of version string
\s* # Ignore leading whitespace
(?:v\.?)? # Optional ""v"" or ""v."" before the version
(?<major>\d+) \. (?<minor>\d+) \. (?<patch>\d+) # MAJOR.MINOR.PATCH
(?:- # Pre-release versions start with '-'
(?<pre> # Capture the pre-release identifier(s)
(?: # The PR rules are annoyingly tight
[0-9A-Za-z-] # No leading `0`, but a `0` on its own is fine
| # More than one character...
[1-9A-Za-z-][0-9A-Za-z-]* # ...means no leading zero
) # That's the FIRST pre-release identifier
(?: # Multiple are allowed...
\. # ...dot-separated...
(?: # ...with the same rules as above
[0-9A-Za-z-]
|
[1-9A-Za-z-][0-9A-Za-z-]*
)
)* # Of course, you can also have just the one
) # End name-cap group `pre`
)? # End non-cap group encompassing the leading `-` and the identifiers
(?: # Built metadata is SIMILAR, but with two differences:
\+ # Difference one: starts with `+`
(?<meta>
[0-9A-Za-z-]+ # Difference two: leading `0` is allowed, so the match rule is simpler
(?:\.[0-9A-Za-z-]+)* # Same dot-delim repetition
) # End name-cap group `meta`
)? # End non-cap group encompassing leading `+` and identifiers
\s* # Ignore trailing whitespace
$ # End version string";
string input = @"1.0.0
1.0.0-alpha
1.0.0-alpha.1
1.0.0-0.3.7
1.0.0-x.7.z.92
1.0.0-alpha+001
1.0.0+20130313144700
1.0.0-beta+exp.sha.5114f85";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace;
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