... not compatible
, I recommend here
reading Friedl's book about Mastering Regular Expressions.
JS' RegEx is based on Perl4, so plenty of things must be excluded.
eLISP RegEx predates Perl (i.e. old POSIX), many escapes are inverted - e.g. \( <-> ( - and since regexes are always strings, any slash must be additionally escaped from string interpolation (leading to so called "slasheritis")
Hope the last 2 phrases were still readable for you.
( addicted to the Perl Programming Language)
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