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That because the pattern is strongly checking for only digit (0 - 9) nothing else
What is this data[i[i]] in your code
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Same. This is by no means a 6kyu skill level challenge. The base solution here is a core fundamental javascript concept.
Happened to me in another kata, but I remember to add 'initialvalue' since then. Haha!
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The first three parentheses are lookaheads to determine whether the given string contains a lowercase letter, an uppercase one and a digit. Then the "main" part goes, which target is to match only strings of size 6 or more containing only appropriate symbols.
P.S. The first three parentheses are not enough to solve the task, since the string aA1# can match, which is obviously is not needed.
if you want to know what a regex pattern is doing, check out regexper.com