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

Find a regex pattern that matches the following string:
1999%3A02%3A18T11:53:21.186Z [/INST] pattern:
\d{4}%3A\d{2}%3A\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z </s>