String with various quantity of the same element

[a123123]

Hello. I need to change every string:

 

aa

aaa

aaaa

 

in general: a{1,} to b - independent of a quantity, there should be only one b. Do you have any ideas to do it?

[sasa]

$b = preg_replace('/a+/', 'b', $a);

[a123123]

Thanks for answer. It works for not special signs. Why doesn't it work with ex. \n (newline)?

[.josh]

If I had to take a guess, you're probably doing '/\n+/' with single quotes.  \n is treated as a literal backslash and n inside single quotes.  Use double quotes "/\n+/"

[a123123]

Thanks for answer. It is the same in both cases ' ' and " ". The problem is about quantity - I need to change every sets of \n, it means \n+, to b letter. It changes, but not to one - one \n changes to one b, two \n to bb, three \n to bbb, and so on. Any way to fix it?

[sasa]

are you 0n linux or windows?

try

preg_replace('/(\n\r?\s*)+/', 'b', $a)