using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(\+420|\+421)?[\s.-]?(\d{3})[\s.-](\d{3})[\s.-](\d{3})";
string substitution = @"<a href='tel:$1$2$3$4'>$1 $2 $3 $4</a>";
string input = @"tel.: +420 257 110 111
fax: +420 257 322 121
<br />tel.: 541 215 662<br />fax: 541 211 431<br />
<p>mob: 605 264 176</p>
<p>mobil: 731 154 552</p>
<p>tel.: 603 162 276</p>
";
RegexOptions options = RegexOptions.Multiline | RegexOptions.CultureInvariant;
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