Regular Expressions 101

Positive Lookbehind(?<=\K1)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

.any character (except for line terminators)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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Search reference

Regular Expression

(?<=\K1)....1

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