====== Regex - Alpha-numeric ======

===== Letters and Numbers only =====

<code>
^[A-Za-z0-9]+$
</code>

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===== Letters and Numbers only (Maximum 3-10 in length) =====

<code>
^[A-Za-z0-9]{3,10}$
</code>

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===== Letters, numbers and Chinese characters =====

<code>
^[\u4E00-\u9FA5A-Za-z0-9]+$
</code>

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===== Letters, numbers and Chinese characters (2-5 in length) =====

<code>
^[\u4E00-\u9FA5A-Za-z0-9]{2,5}$
</code>

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