regex - Replace Non-letters except apostrophe in java -

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i have few strings contain non-letters. 

string = "it's. (fish)[]//;!"

i want return string says:

it's fish

i have used string.replace() method it's bit tedious. tried using 

 a.replaceall("\\w", "")

but removes apostrophe. there simple way of removing non-letters while keeping apostrophe?

you can use java specific construct here:

a.replaceall("[\\w&&[^']]", "")

the specific construct here character class: x&&[y], meaning: match x , y. y can valid within character class.

available since java 5 if recall correctly.


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