How to use Regex to remove redundant whitespace?

Question

I need a little bit of your help if you can. I need the regular expression in php to remove multiple new lines and redundant whitespaces if occur more than 1.

for example

Hi    this  is
    a


test      code

------------------> convert above into

Hi this is
a
test code

Answer 1

Use :

echo preg_replace("/(^\s+|\s+$)/m","\r\n",$text);

Ref: Link:

How do you trim white space on beginning and the end of each new line with PHP or regex