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

Find a regex pattern that matches the following string:
2000%5D09%5D29T05%2004%2027.857 [/INST] pattern:
\d{4}%5D\d{2}%5D\d{2}T\d{2}%20\d{2}%20\d{2}\.\d{3} </s>