使用PHP正则表达式替换换行符

Question

I am trying to replace all the in a json string with a double pipe ||. Here is an example of a string :

{"comment":"test1
test2
test3"}';

Here is the regex I have done :

preg_match('/"comment":"(([^
\t"]*)([
\t]*))+"/', $a, $t);

The result of this preg_match is

Array
(
    [0] => "comment":"test1
test2
test3"
    [1] => 
    [2] => 
    [3] => 
)

I can't find what is wrong with my regexp.

Do I need a recursive pattern (?R) ?

Thanks.

Answer 1

Use preg_replace function like below. I assumed that your input have balanced paranthesis.

preg_replace('~(?:"comment"[^
]*|\G)\K
([^{}
]*)~', '||\1', $str)

DEMO