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

Find a regex pattern that matches the following string:
1999%3F01%3F15T00$2046$2017 [/INST] pattern:
\d{4}%3F\d{2}%3F\d{2}T\d{2}\$20\d{2}\$20\d{2} </s>