I'm working on an email validation regex in PHP and I need to know how long the TLD could possibly be and still be valid. I did a few searches but couldn't find much information on the topic. So how long can a TLD possibly be?
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os 与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
