using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"width:[0-9]+[a-z]{2};?";
string input = @"hello this is paragragph and this is image 1
<img src='https://www.google.co.id/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png' style='width:150px;heigh:150px'>
this is text and this is image 2
<img src='http://www.bing.com/az/hprichbg/rb/HumpbackWhaleReunion_ROW11050338497_1366x768.jpg' style='width:150px;heigh:150px' ></p>";
RegexOptions options = RegexOptions.IgnoreCase;
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