{"id":32811,"date":"2023-02-02T02:49:45","date_gmt":"2023-02-01T21:19:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-regex-condition-in-c\/"},"modified":"2023-02-02T02:49:45","modified_gmt":"2023-02-01T21:19:45","slug":"solved-regex-condition-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-regex-condition-in-c\/","title":{"rendered":"[Solved] Regex condition in C#"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-33669287\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33669287\" data-parentid=\"33669163\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>As you further explained that you actually do want to match <em>any<\/em> letter at the beginning, and <em>any<\/em> two digits at the end of the string, using a regular expression is indeed the shortest way to solve this.<\/p>\n<pre><code>Regex re = new Regex(\"^[a-z].*[0-9]{2}$\", RegexOptions.IgnoreCase);\n\nConsole.WriteLine(re.IsMatch(\"Apple02\")); \/\/ true\nConsole.WriteLine(re.IsMatch(\"Arrow\")); \/\/ false\nConsole.WriteLine(re.IsMatch(\"45Alty12\")); \/\/ false\nConsole.WriteLine(re.IsMatch(\"Basci98\")); \/\/ true\n<\/code><\/pre>\n<hr>\n<p>Otherwise, if your requirement is simple, e.g. just the letter <code>A<\/code> or <code>a<\/code> at the beginning, and <code>12<\/code> or <code>02<\/code> at the end, then you can also solve this easily without regular expressions:<\/p>\n<pre><code>bool Match(string s)\n{\n    if (string.IsNullOrWhiteSpace(s))\n        return false;\n\n    if (s[0] != 'a' &amp;&amp; s[0] != 'A')\n        return false;\n\n    return s.EndsWith(\"02\") || s.EndsWith(\"12\");\n}\n<\/code><\/pre>\n<p>Examples:<\/p>\n<pre><code>Console.WriteLine(Match(\"Apple02\")); \/\/ true\nConsole.WriteLine(Match(\"Arrow\")); \/\/ false\nConsole.WriteLine(Match(\"45Alty12\")); \/\/ false\nConsole.WriteLine(Match(\"a12\")); \/\/ true\nConsole.WriteLine(Match(\"a\")); \/\/ false\nConsole.WriteLine(Match(\"12\")); \/\/ false\n<\/code><\/pre>\n<hr>\n<p>Of course you can also expand this to fit your more complex requirement. In your case, you could use <code>char.IsLetter<\/code> and <code>char.IsDigit<\/code> to make the checks:<\/p>\n<pre><code>bool Match(string s)\n{\n    if (string.IsNullOrWhiteSpace(s))\n        return false;\n\n    return s.Length &gt; 2 &amp;&amp; char.IsLetter(s[0]) &amp;&amp;\n        char.IsDigit(s[s.Length - 1]) &amp;&amp; char.IsDigit(s[s.Length - 2]);\n}\n<\/code><\/pre>\n<p>Note that the <code>IsLetter<\/code> method also accepts letters from non-English alphabets, so you might need to change that. You could alternatively make a comparison like this:<\/p>\n<pre><code>bool Match(string s)\n{\n    if (string.IsNullOrWhiteSpace(s))\n        return false;\n\n    return s.Length &gt; 2 &amp;&amp;\n        ((s[0] &gt;= 'a' &amp;&amp; s[0] &lt;= 'z') || (s[0] &gt;= 'A' &amp;&amp; s[0] &lt;= 'Z'))\n        char.IsDigit(s[s.Length - 1]) &amp;&amp; char.IsDigit(s[s.Length - 2]);\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">10<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Regex condition in C# <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] As you further explained that you actually do want to match any letter at the beginning, and any two digits at the end of the string, using a regular expression is indeed the shortest way to solve this. Regex re = new Regex(&#8220;^[a-z].*[0-9]{2}$&#8221;, RegexOptions.IgnoreCase); Console.WriteLine(re.IsMatch(&#8220;Apple02&#8221;)); \/\/ true Console.WriteLine(re.IsMatch(&#8220;Arrow&#8221;)); \/\/ false Console.WriteLine(re.IsMatch(&#8220;45Alty12&#8221;)); \/\/ false Console.WriteLine(re.IsMatch(&#8220;Basci98&#8221;)); &#8230; <a title=\"[Solved] Regex condition in C#\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-regex-condition-in-c\/\" aria-label=\"More on [Solved] Regex condition in C#\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,347],"class_list":["post-32811","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-regex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Regex condition in C# - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-regex-condition-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Regex condition in C# - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] As you further explained that you actually do want to match any letter at the beginning, and any two digits at the end of the string, using a regular expression is indeed the shortest way to solve this. Regex re = new Regex(&quot;^[a-z].*[0-9]{2}$&quot;, RegexOptions.IgnoreCase); Console.WriteLine(re.IsMatch(&quot;Apple02&quot;)); \/\/ true Console.WriteLine(re.IsMatch(&quot;Arrow&quot;)); \/\/ false Console.WriteLine(re.IsMatch(&quot;45Alty12&quot;)); \/\/ false Console.WriteLine(re.IsMatch(&quot;Basci98&quot;)); ... 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Regex re = new Regex(\"^[a-z].*[0-9]{2}$\", RegexOptions.IgnoreCase); Console.WriteLine(re.IsMatch(\"Apple02\")); \/\/ true Console.WriteLine(re.IsMatch(\"Arrow\")); \/\/ false Console.WriteLine(re.IsMatch(\"45Alty12\")); \/\/ false Console.WriteLine(re.IsMatch(\"Basci98\")); ... 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