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

Find a regex pattern that matches the following string:
1990%3D02%3D24 00:48:19.593 [/INST] pattern:
\d{4}%3D\d{2}%3D\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3} </s>