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

Find a regex pattern that matches the following string:
2008%2E01%2E23 00:54:01.870 [/INST] pattern:
\d{4}%2E\d{2}%2E\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>