<s>[INST] <<SYS>>
You are an expert in regular expressions (regex)
<</SYS>>

Find a regex pattern that matches the following string:
1994%7C02%7C01T16%3B29%3B53.795 [/INST] pattern:
\d{4}%7C\d{2}%7C\d{2}T\d{2}%3B\d{2}%3B\d{2}\.\d{3} </s>