using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"([£€$])?(?=(\d{1,3}(?:,\d{3})*(?:\.\d+)?(?![\d.,])(?:\s*(?:[tTbB]n|m|(?:[tT]r|[bBmM])illion)\b)?)(\s*(?:[pP](?:ence)?|[cC](?:ents?)?|€|[eE]uros?|[dD]ollars?|[pP]ounds?)\b)?)(?(1)\2(?!\3)|(?<![£€$])\2\3)";
string input = @"$1 dollar ✘
1 ✘
$1 tn dollars ✘
$1,00000.000,000 ✘
1,000.00 ✘
$1 ✓
1 pence ✓
1 cent ✓
1 euro ✓
1 dollar ✓
1 pound ✓
$1 tn ✓
$1 trillion ✓
1 trillion dollars ✓
$1,000,000,000,000 ✓
$1.000 ✓
$1,000,000,000,000.000000 ✓
This sentence is worth 1 dollar, at least. More likely $2 or $3.";
foreach (Match m in Regex.Matches(input, pattern))
{
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