Regular Expressions 101

Positive Lookbehind(?<=\d)

\da Unicode decimal digit

Positive Lookahead(?=\D)

\Dany character that is not a Unicode decimal digit

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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Search reference

Regular Expression

(?<=\d)(?=\D)

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