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

Find a regex pattern that matches the following string:
2015%2B01%2B17 07:15:33.591 [/INST] pattern:
\d{4}%2B\d{2}%2B\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>