preg_match between newlines and beginning or ending

Question

I have a number of lines in my value where I need to run preg_match between newlines, returns and beginning or end.

$text = "
ENG CHG NOTE
2A
LTR CHK
AH 2000
YE
NOTE 2
";

for example:

preg_match("/((?P<value>\\d+(.\\d+)*?)\s?(?P<unit>YE))/"

I want to make sure that preg_match is only looking for digits and YE in the above example. In this example 2000, which belongs to AH, would show a false value for YE. How can I include \r\n and beginning or end, surrounding my current regex?

Answer 1

In this example 2000, which belongs to AH, would show a false value for YE. How can I include \r\n and beginning or end, surrounding my current regex?

In the example you have, the number comes right after a YE followed with a newline. Since \s matches a newline symbol, too, you need to adjust the pattern to match only horizontal spaces.

There are two patterns you may leverage here: \h or [^\S\r\n].

'~(?P<value>\d+(?:.\d+)*?)\h?(?P<unit>YE)~'
                          ^^

See this regex demo. PHP demo:

$re = '~(?P<value>\d+(?:.\d+)*?)\h?(?P<unit>YE)~'; 
$str = "ENG CHG NOTE\n2A\nLTR CHK\nAH 2000\nYE\nNOTE 2\n3444 YE\n"; 
preg_match_all($re, $str, $matches);
print_r($matches);