Capture if else if else

if.php

<?php

$pattern = "(?<if_all>(?<if>(?:if)\s*\(\s*.*\s*\)\s*\{\s*.*\s*\}\s*)\s*(?<elseif>(?:(?:else if|elseif)\s*\(\s*.*\s*\)\s*\{\s*.*\s*\}\s*){0,}+)\s*(?<else>(?:else)\s*\{\s*.*\s*\}\s*){0,1})";
$haystack = "

if(x)
{
	xxxxx
}
else if (x)
{
	xxxx
}
else if (x)
{
	xxxx
}
else
{
	xxxx
}

";

preg_match($pattern, $haystack $match);

print_r($match);

/*
Full match	0-75	`if(x)
{
	xxxxx
}
else if (x)
{
	xxxx
}
else if (x)
{
	xxxx
}
else
{
	xxxx
}`
Group 1.	0-75	`if(x)
{
	xxxxx
}
else if (x)
{
	xxxx
}
else if (x)
{
	xxxx
}
else
{
	xxxx
}`
Group 2.	0-17	`if(x)
{
	xxxxx
}
`
Group 3.	17-61	`else if (x)
{
	xxxx
}
else if (x)
{
	xxxx
}
`
Group 4.	61-75	`else
{
	xxxx
}`
*/