REGEX-Escape for: (\b(?<={)\d+(?=})\b)(?![\s\S]*\b\1\b)

Your Input:
Result, the escaped string:
\(\\b\(\?\<\=\{\)\\d\+\(\?\=\}\)\\b\)\(\?\!\[\\s\\S\]\*\\b\\1\\b\)

What must the escaping look like for:
(\b(?<={)\d+(?=})\b)(?![\s\S]*\b\1\b)

The excaped text for use in a regex is:
\(\\b\(\?\<\=\{\)\\d\+\(\?\=\}\)\\b\)\(\?\!\[\\s\\S\]\*\\b\\1\\b\)


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Current RegEx escapings: