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Split string by uppercase followed by lowercase

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Posted on by JLS_

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Hello community!

I need to split a string (file name) by uppercase followed by lowercase (or lowercase followed by uppercase)

Reason: I have a file name where all words and acronyms are written as one string. I have to split it, but acronyms have to be ignored.

Example: ImportantInformationFromCEOMaxMusterman

Desired output: Important Information From CEO Max Musterman

I managed it to split it by every capital letter, but it is not that what we really need.

I understand, that the logic has to be like here: python example or here

but I struggle with translating it into "PowerAutomate".

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DJ_Jamba 2,837 Moderator on at

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Hi @JLS_

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Chriddle 8,515 Super User 2026 Season 1 on at

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Select

From

range(0, length(outputs('Compose')))

Map

if( greater(item(), 0), if( and( contains('ABCDEFGHIJKLMNOPQRSTUVWXYZ', chunk(outputs('Compose'), 1)[item()]), or( not(contains('ABCDEFGHIJKLMNOPQRSTUVWXYZ', chunk(outputs('Compose'), 1)[sub(item(), 1)])), contains('abcdefghijklmnopqrstuvwxyz', chunk(outputs('Compose'), 1)?[add(item(), 1)]) ) ), concat(' ', chunk(outputs('Compose'), 1)[item()]), chunk(outputs('Compose'), 1)[item()] ), chunk(outputs('Compose'), 1)[item()] )

Compose 2

join(body('Select'), '')

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