Regular Expressions 101

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/
(?:'|")(\.+)(?:'|")
/
g
Non-capturing group
(?:'|")
1st Alternative
'
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
2nd Alternative
"
" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
1st Capturing Group
(\.+)
\.
matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:'|")
1st Alternative
'
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
2nd Alternative
"
" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
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