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    <p>A digit in the range 1-9 followed by zero or more other digits:</p> <pre><code>^[1-9]\d*$ </code></pre> <p>To allow numbers with an optional decimal point followed by digits. A digit in the range 1-9 followed by zero or more other digits then optionally followed by a decimal point followed by at least 1 digit:</p> <pre><code>^[1-9]\d*(\.\d+)?$ </code></pre> <p><strong>Notes:</strong></p> <ul> <li><p>The <code>^</code> and <code>$</code> anchor to the start and end basically saying that the whole string must match the pattern</p></li> <li><p><code>()?</code> matches 0 or 1 of the whole thing between the brackets</p></li> </ul> <p><strong>Update to handle commas:</strong></p> <p>In regular expressions <code>.</code> has a special meaning - match any single character. To match literally a <code>.</code> in a string you need to <em>escape</em> the <code>.</code> using <code>\.</code> This is the meaning of the <code>\.</code> in the regexp above. So if you want to use comma instead the pattern is simply:</p> <pre><code>^[1-9]\d*(,\d+)?$ </code></pre> <p><strong>Further update to handle commas and full stops</strong></p> <p>If you want to allow a <strong>.</strong> between groups of digits and a <strong>,</strong> between the integral and the fractional parts then try:</p> <pre><code>^[1-9]\d{0,2}(\.\d{3})*(,\d+)?$ </code></pre> <p>i.e. this is a digit in the range 1-9 followed by up to 2 other digits then zero or more groups of a full stop followed by 3 digits then optionally your comma and digits as before.</p> <p>If you want to allow a <strong>.</strong> anywhere between the digits then try:</p> <pre><code>^[1-9][\.\d]*(,\d+)?$ </code></pre> <p>i.e. a digit 1-9 followed by zero or more digits or full stops optionally followed by a comma and one or more digits.</p>
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    1. PODecimal or numeric values in regular expression validation
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    1. CO+1 (but use "^[1-9][0-9]*$" for those older regex engines that don't support PCRE).
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    2. COMake that `^([1-9]\d*|0)$` if zero is a valid number.
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    3. COthanks it's done. But i forgot say something. Users entered value also include "," character.. how do i do please
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