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

Find a regex pattern that matches the following string:
2006%5F10%5F04T10%2E03%2E07.123 [/INST] pattern:
\d{4}%5F\d{2}%5F\d{2}T\d{2}%2E\d{2}%2E\d{2}\.\d{3} </s>