Regular Expressions 101

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/
(.*?)<hr \/>
/
sg
1st Capturing Group
(.*?)
.
matches any character
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
<hr
matches the characters <hr literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
Global pattern flags
s modifier: single line. Dot matches newline characters (draft)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
sg

Test String