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[:lower:]? and [:upper:]? dont find low- and uppercase letters in text???

Hello! I tried: [:lower:] /p [:lower:]? /p [[:lower:]] /p [[:lower:]] /p

to find lower case letters in text, but nothing works??? many thanks for all advices!! (writer)

[:lower:]? and [:upper:]? dont find low- and uppercase letters in text???

Hello! I tried: [:lower:] /p /br [:lower:]? /p /br [[:lower:]] /p /br [[:lower:]] /p/br

to find lower case letters in text, but nothing works??? many thanks for all advices!! (writer)

[:lower:]? and [:upper:]? dont find low- and uppercase letters in text???

Hello! I tried: tried:
[:lower:] /br
[:lower:]? /br
[[:lower:]] /br [[:lower:]] /br
[[:lower:]]?

to find lower case letters in text, but nothing works??? many thanks for all advices!! (writer)