Regular Expressions 101

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/
^https.(jpg|jpeg|png)$
/
g
^ asserts position at start of the string
http matches the characters http literally (case sensitive)
s
matches the character s literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
1st Capturing Group
(jpg|jpeg|png)
1st Alternative
jpg
jpg matches the characters jpg literally (case sensitive)
2nd Alternative
jpeg
jpeg matches the characters jpeg literally (case sensitive)
3rd Alternative
png
png matches the characters png literally (case sensitive)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String