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

Find a regex pattern that matches the following string:
2011%2F11%2F19 23:50:10.040 [/INST] pattern:
\d{4}%2F\d{2}%2F\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>