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Or are there any other ways besides using regex? Thanks.

Hi,
Can anyone help me to find regular expression for the following in Perl?
"The string can only contain lower case letters (a-z) and no more than one of any letter."
For example: "table" is...

I have got a question. How to do this? I mean AND expression in regex.

List all the files in current directory that do not contain the words use AND take.

Thx.:p