+matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Positive Lookahead
(?=(\3|^))
Assert that the Regex below matches
2nd Capturing Group
(\3|^)
1st Alternative
\3
\3matches the same text as most recently matched by the 3rd capturing group
2nd Alternative
^
3rd Capturing Group
(\2x)
\2matches the same text as most recently matched by the 2nd capturing group
x
matches the character x literally (case sensitive)
4th Capturing Group
((?<=(?=z|^\3$|(?4)).))
Positive Lookbehind
(?<=(?=z|^\3$|(?4)).)
Assert that the Regex below matches
5th Capturing Group
(\3x)
\3matches the same text as most recently matched by the 3rd capturing group
x
matches the character x literally (case sensitive)
+matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\5
matches the same text as most recently matched by the 5th capturing group
+matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
$asserts position at the end of a line
Lines are delimited by \n
Global pattern flags
g modifier:global. All matches (don't return after first match)
m modifier:multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)