Assume we have this text:
...
settingsA=9, 4.2
settingsB=3, 1.5, 9, 2, 4, 6
settingsC=8, 3, 2.5, 1
...
The question is how can I capture all the numbers that are in specific row using a single step?
Single step means:
- single regex pattern.
- single operation (no loops or splits, etc.)
- all matches are captured in one array.
Let's say I want to capture all the numbers that are present in row which starts with settingsB=. The final result should look like this:
3
1.5
9
2
4
6
My failed attempts:
<?php
$subject =
"settingsA=9, 4.2
settingsB=3, 1.5, 9, 2, 4, 6
settingsC=8, 3, 2.5, 1";
$pattern = '([\d\.]+)(, )?' // FAILED!
$pattern = '(?:settingsB=)(?:([\d\.]+)(?:, )?)' // FAILED!
$pattern = '(?:settingsB=)(?:([\d\.]+)(?:, )?)+' // FAILED!
$pattern = '(?<=^settingsB=|, )([\d+\.]+)' // FAILED!
preg_match_all($pattern, $subject, $matches, PREG_SET_ORDER);
if ($matches) {
print_r($matches);
}
?>
UPDATE 1: @Saleem's example uses multiple steps instead of a single step, unfortunately. I'm not saying that his example is bad (it actually works), but I want to know if there is another way to do it and how. Any ideas?
UPDATE 2: @bobble bubble provided a perfect solution for this challenge.