using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"([1-9][0-9]*[eE][1-9][0-9]*|(([1-9][0-9]*\.)|(\.[0-9]+))([0-9]*)?([eE][\-\+]?[1-9][0-9]*)?)";
string input = @"Matches
3.
3.3
3.3e2
3.3e-1
.1e1
1.11e12
1.3e-1
.1e1
.2e-14
5E6
No match
3
E9
.e3
7E
# Saker
Exponent:
[eE][\-\+]?[1-9][0-9]*
Siffra:
[1-9][0-9]*
# Förklaring
Stora parantesen
Alt1:
Siffra sen E utan punkt (slutar)
[1-9][0-9]*[eE][1-9][0-9]*
Alt2:
(([1-9][0-9]*\.)|(\.[0-9]+))([0-9]*)?([eE][\-\+]?[1-9][0-9]*)?
vänsta sidan innan ([0-9]*)?
parantes (([1-9][0-9]*\.)|(\.[0-9]+))
Alt1: ([1-9][0-9]*\.)
Non Zero leading- siffra sen punkt
Alt2: (\.[0-9]+)
Punkt sen (måste) siffra
Högra sidan ([0-9]*)?([eE][\-\+]?[1-9][0-9]*)?
([0-9]*)?
kanske siffra
([eE][\-\+]?[1-9][0-9]*)?
kanske exponent
";
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