C# Regular Expression

[JSChicago]

Hello,

I've been pulling my hair out over this and hope someone can help.

I need a regular expression that will only match a single word that:

1. Must be exactly 12 alphanumeric characters in length

2. Must contain at least 3 letters

3. Must end in exactly 2 digits

Closest I've gotten is: \b^([a-zA-Z0-9]{12})|(\d{2}$)\b

and it just doesn't work

Thanks in advance for any assistance

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