How to return only named groups with preg_match or preg_match_all?

user_393087 0
Viewed 17229

Example:

$string = "This is some text written on 2010-07-18.";
preg_match('|(?<date>\d\d\d\d-\d\d-\d\d)|i', $string, $arr_result);
print_r($arr_result);

Returns:

Array
(
    [0] => 2010-07-18
    [date] => 2010-07-18
    [1] => 2010-07-18
)

But I want it to be:

Array
(
    [date] => 2010-07-18
)

In PHP's PDO object there is an option that is filtering results from database by removing these duplicate numbered values : PDO::FETCH_ASSOC. But I haven't seen similar modifier for the PCRE functions in PHP yet.

preg-match php regex
9 Answers

You could use T-Regx and go with group() or namedGroups() which only returns named capturing groups.

<?php
$subject = "This is some text written on 2010-07-18.";

pattern('(?<date>\d\d\d\d-\d\d-\d\d)', 'i')->match($subject)->first(function ($match) {

    $date = $match->get('date'); 
    // 2010-07-18

    $groups = $match->namedGroups(); 
    // [
    //   'date' => '2010-07-18'
    // ]   
});
user_34290150

I use some of introduced codes and this is the final code works on php 5.6+:

$re = '/\d+\r\n(?<start>[\d\0:]+),\d+\s--\>\s(?<end>[\d\0:]+),.*\r\nHOME.*\r\nGPS\((?<x>[\d\.]+),(?<y>[\d\.]+),(?<d>[\d\.]+)\)\sBAROMETER\:(?<h>[\d\.]+)/';

$str= file_get_contents($srtFile);
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
echo '<pre>';
$filtered=array_map(function ($d){
     return $array_filtered = array_filter($d, "is_string", ARRAY_FILTER_USE_KEY);
    },$matches);
var_dump($filtered);

if you are interested what it does it read position data from a str file that DJI drones generate while recording video.

user_42383230
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