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

Find a regex pattern that matches the following string:
1998%6009%6029 23:34:08.849 [/INST] pattern:
\d{4}%60\d{2}%60\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>