Regular Expressions 101

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/
(.*)style\(data-above-the-fold="true"\)[*\s\S]
/
gm
1st Capturing Group
(.*)
.
matches any character (except for line terminators)
* 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)
Match a single character present in the list below
[\s\S]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
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