Regular Expressions 101

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/
^(\s*)style\(data-above-the-fold="true"\)\.\n(\1\s+.*\n)*
/
gm
^ asserts position at start of a line
1st Capturing Group
(\s*)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
style matches the characters style literally (case sensitive)
\( matches the character ( literally (case sensitive)
data-above-the-fold="true" matches the characters data-above-the-fold="true" literally (case sensitive)
\) matches the character ) literally (case sensitive)
\. matches the character . literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
2nd Capturing Group
(\1\s+.*\n)*
* matches the previous token between zero 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
\1 matches the same text as most recently matched by the 1st capturing group
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
.
matches any character (except for line terminators)
\n matches a line-feed (newline) character (ASCII 10)
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)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
gm

Test String