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

Find a regex pattern that matches the following string:
2007%7C12%7C02 20:42:35.694 [/INST] pattern:
\d{4}%7C\d{2}%7C\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>