PHP - Find all 3 digit numbers in a paragraph

I'm using php and have a variable with several paragraphs of text. In each paragraph there's at least one 3 digit number. I need to get a list of each 3 digit number. I only want the first 3 digit number found in each paragraph. For example...

$text="this is a test 123 this is a test, blah blah blah

This is the next paragraph 456 and more text 789 and more more more

And another paragragh is here 222 and that's all.";

I want to end up with a list that looks like this

123,456,222

CodePudding user response：

Use /^.*?(\d{3})/m with preg_match_all and get only the captured groups.

preg_match_all("/^.*?(\d{3})/m", $text, $matches);
print_r($matches[1]);  // Array ( [0] => 123 [1] => 456 [2] => 222 )

CodePudding user response：

Another regex on getting only the firstly appeared 3-digit numbers in each line

preg_match_all("/^(?:\D|\s\d{1,2}\s|\s\d{4,}\s)*\s(\d{3})\s.*$/m", $text, $matches);
print_r($matches[1]);  // Array ( [0] => 123 [1] => 456 [2] => 222 )

tested string

$text="this is 2255 a test 123 this is a test, blah blah blah

This is the 11 next paragraph 456 and more text 789 and more more more

And another paragragh is here 222 and that's all.";