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    <p>First of all, the character <code>.</code> is called a dot, or period, or full stop, or decimal point, while a comma is the character: <code>,</code>.</p> <p>Second, you can designate a digit in regex in a character class: <code>[0-9]</code> means any digit between 0 to 9.</p> <p>A dot in regex will match any character, so you need to escape it by means of a backslash (or putting it in a character class).</p> <p>Remember though that the elements in the same character class can be in any order, so that if you want to get something having digits and a dot and use <code>[0-9.]</code> it will match any digit, or a dot.</p> <p>Now, you will need finite quantifiers for your task, which are designated by braces in the form of <code>{m,n}</code> where <code>m</code> is the minimum and <code>n</code> the maximum. If you now use... <code>[0-9.]{1,15}</code> it would mean the character class <code>[0-9.]</code> repeated 1 up to 15 times.</p> <p>But if you use <code>[0-9.]{1,15}</code>, it will also match <code>......</code> or <code>1234</code> (remember I said earlier that the order did not matter.</p> <p>So, applying all this, you get the regex:</p> <pre><code>[0-9]{1,15}\.[0-9]{1,3} </code></pre> <p>Now, since you are doing a validation, you will need anchors to specify that the regex should test the whole string (instead of simply finding a match).</p> <pre><code>^[0-9]{1,15}\.[0-9]{1,3}$ </code></pre> <p>Last, since you can have optional decimals, you will have to use a group and the quantifier <code>?</code> which means 0 or 1:</p> <pre><code>^[0-9]{1,15}(?:\.[0-9]{1,3})?$ </code></pre> <p>In your code, you will create the regex a bit like this:</p> <pre><code>string myString = "123456789.123"; var regexp = new Regex(@"^[0-9]{1,15}(?:\.[0-9]{1,3})?$"); var setMatches = regexp.Matches(myString); foreach (Match match in setMatches) { Console.WriteLine(match.Groups[0].Value); } </code></pre> <p>This will output the decimal if it passed the regex.</p> <p>Or something like this:</p> <pre><code>string myString = "123456789.123"; Match match = Regex.Match(myString, @"^[0-9]{1,15}(?:\.[0-9]{1,3})?$"); if (match.Success) { Console.WriteLine(match.Groups[0].Value); } </code></pre>
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    1. PONeed Regular Expression that Validate Decimal (18,3)
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    1. USJerry
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    1. COthanks a lot [0-9]{1,15}\.[0-9]{1,3} is working fine but i have to enter 3 digits after DOT , can i make it optional to take the digits after dot ?
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    2. CO@user2828076 Oh, right, sure. I actually missed that part ^^; I'll add it to my answer in a bit
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    3. CO@user2828076 Done, I've edited that part in my answer.
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