Why is parenthesis not escaped in regex?

Question

Regular Expressions

There is a conditional chemical reaction

NH3 + K[Al(OH)4] + NaCl trying to find the substance K[Al(OH)4] in it

using a regular expression . /\bK\[Al\(OH\)4\]\b/iThe first bracket [ is escaped, but the second ] is not. How to fix it?
https://regex101.com/r/Fv6Qc9/2

Answer 1

\bK\[Al\(OH\)4\](?=\s|\b)
https://regex101.com/r/Fv6Qc9/3