Databases
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    <p><code>/^[a-z0-9]+#[a-z0-9]+$/i</code> should do the trick.</p> <p><code>/^[a-z0-9]+(#[a-z0-9]+)?$/i</code> if the '#' is optional</p> <p><code>[a-z0-9]+</code> means one or more letter or number (the <code>+</code> means one or more)</p> <p><code>(#[a-z0-9]+)?</code> means a '#' followed by the above, but the whole thing either zero or one times (<code>?</code> means zero or one)</p> <p>The <code>^</code> and <code>$</code> anchor the whole thing at the beginning and end</p> <p>The <code>i</code> means case-insensitive</p> <p>Thus, this will match one or more alphanum, optionally followed by a '#' and then one or more alphanums.</p> <p>If you want more '#' characters, you could use <code>/^[a-z0-9]+([#a-z0-9]+[a-z0-9])?$/i</code> instead. This will match one or more alphanum, optionally followed by one or more '#' or alphanums, and then an alphanum.</p> <p>You could also use <code>\w</code> for alphanumeric characters. Notice, however, that this is the same as <code>[a-zA-Z0-9_]</code>, and would allow the <code>_</code> underscore character. If you do not want the underscore, you should stick with <code>[a-zA-Z0-9]</code> (or <code>[a-z0-9]</code> with the <code>i</code>)</p> <p><strong>EDIT</strong> saw you wanted spaces. try this (it worked with all of my tests):</p> <pre><code>/^[a-z0-9]+(([#a-z0-9\s]+)?[a-z0-9])?$/i </code></pre> <p>Note about this: It does not allow spaces at the beginning and end, but will allow consecutive spaces. It will allow optional '#' characters, and any number of them. <code>\s</code> means whitespace</p>
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    1. POJavascript RegEx pattern to have only alphanumeric and hash(#) symbol in the middle
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    1. PTAnswer
    1. USwlyles
    1. USwlyles
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      1. VTUpMod
    1. COThis is a well written and thorough answer. +1
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      1. USBlackVegetable
 

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A row detail

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