删除字符串末尾带有[]并在下一行开头[[]的字符串中的空格和回车符

Question

I am relatively new to regular expressions. I just wanted to know that how to replace empty spaces or carriage return ( new line ) through preg_replace in php for this string:

[someshortcode]

[someshortcode]

The string has ] at the end of one line and [ at the new line. I want to remove any spaces/ characters be it '\\r' , '\\t' , '\\n' , empty spaces or any other character

output should be like this: [someshortcode][someshortcode]

Thanks

Answer 1

$result = preg_replace("/\s/", '', $string);

You can learn more about the "\\s" and others in Escape sequences

Update :

I'd like to add an alternative with POSIX compliant regular expression, where you could use the following line, which by the way would also match the VT character (code 11):

$result = preg_replace("/[[:space:]]/", '', $string);

More about Character classes