If that were to fail to match, then it would fail to match very badly, as in O(N**K) badly. Better:
/^[^a]*?a[^b]*?b[^c]*?c[^d]*?d/
or use features that I don't use and so don't remember to prevent backtracking. The above version should proceed to match the string linearly and in O(n) and, if that fails, backtrack linearly in O(n) and quickly fail.
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