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

Find a regex pattern that matches the following string:
2018%4012%4017T15:12:02.203 [/INST] pattern:
\d{4}%40\d{2}%40\d{2}T\d{2}:\d{2}:\d{2}\.\d{3} </s>