Getting all data from line before and after the matched pattern-CodePudding

I am trying to search a log file for a pattern using preg_match_all however the regex doesn't seem to be working quite right. It saying no matches

Here is a sample line from the log file

04:19:58 | Player "xxx" (id=xxx pos=<3748.4, 5976.5, 403.3>)

I am trying to search for the pos=< > and store the values in an array but I also need the other content on the line

  $contents = file_get_contents('logs/'.$log);

  $pattern = '/pos=<(.*?),(.*?),(.*?)>/m';

 // search, and store all matching occurences in $matches
 if(preg_match_all($pattern, $contents, $matches)){
 echo "Found matches:\n";
 echo implode("\n", $matches[0]);
 }
 else{
 echo "No matches found";
 }

CodePudding user response：

Try this regex

$pattern = '/pos\=\<(.*?)\,(.*?)\,(.*?)\>/m';

Use regex debuggers like this one https://regex101.com

CodePudding user response：

For the example string, you can add an extra capture group before the opening <

Note that you don't need the /m flag as there are no anchors in the pattern.

The .*? part can be written using a negated character class [^,\r\n]* to match any char except a newline or , to prevent the non greedy quantifier and some backtracking.

See a PHP demo and a regex demo.

$pattern = '/(pos=)<([^,\r\n]*),([^,\r\n]*),([^,\r\n]*)>/';

if(preg_match_all($pattern, $contents, $matches)){
    echo "Found matches:\n";
    print_r($matches);
}
else{
    echo "No matches found";
}

Output

Found matches:
Array
(
    [0] => Array
        (
            [0] => pos=<3748.4, 5976.5, 403.3>
        )

    [1] => Array
        (
            [0] => pos=
        )

    [2] => Array
        (
            [0] => 3748.4
        )

    [3] => Array
        (
            [0] =>  5976.5
        )

    [4] => Array
        (
            [0] =>  403.3
        )

)