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    <pre><code>((\d{9})|(\d{11})$ </code></pre> <p>...is not a valid regular expression because it is missing a parenthesis.</p> <p>Here is the corrected regular expression which you probably intended to write in your question:</p> <pre><code>((\d{9})|(\d{11}))$ </code></pre> <p>Now, as to your question, you would like to limit the number of digits entered to only 9 or 11. Here's how to do that:</p> <pre><code>^((\d{9})|(\d{11}))$ </code></pre> <p>What we are doing is defining the start <code>^</code> and end <code>$</code> of the expression so that the regular expression engine knows how to parse the data.</p> <p>If you don't define a start and an end, the expression is "greedy" by default, which is why it was matching more than 9 or 11 digits. Since you only defined an end, it matched <em>all</em> occurrences of start, which is each combination of 9 or 11.</p> <p>As already pointed out, if you want to match characters, you'll need to substitute a different expression:</p> <pre><code>^((.{9})|(.{11}))$ </code></pre> <p>If you only want to match numbers, letters, and underscores, you could use this:</p> <pre><code>^(([A-Za-z_0-9]{9})|([A-Za-z_0-9]{11}))$ </code></pre> <p>However, in any case, the expression can be more easily defined as:</p> <pre><code>^.{9,11}$ </code></pre> <p>And you would substitute either <code>[A-Za-z_0-9]</code> or <code>\d</code> depending on your needs.</p> <p>The additional <code>()</code> you have around your original expression are not needed for a basic matching regular expression. They are required if you need capture groups for replacements.</p>
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