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

Find a regex pattern that matches the following string:
2009-01-29+09%2F50%2F54.631 [/INST] pattern:
\d{4}\-\d{2}\-\d{2}\+\d{2}%2F\d{2}%2F\d{2}\.\d{3} </s>