Regex extract all numbers specific lenght starting from last

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For example i have numbers text

8.40083897*
S903040058061*
51097653
1.51097653P
0051384034*51384034* 40083897* 40078422**

I need get from this

40083897*
40058061*
51097653
51097653
51384034*
40078422**

So i use regex

/([0-9*]{8,10})/

It work good except it takes and count numbers from left, how say to regex count from right?

So if exist * then start counting from asteriks and length only 9
So if exist ** then start counting from last asteriks and length only 10
So if not exist * then start counting from last digit and length only 8
php regex
1 Answers

You can use

\d{8}(?!\d)\*{0,2}(?!\*)

See the regex demo.

Details

  • \d{8} - any eight digits
  • (?!\d) - no digit on the right is allowed
  • \*{0,2} - zero, one or two asterisks
  • (?!\*) - not followed with another asterisk.

See the PHP demo:

$s = "8.40083897*\nS903040058061*\n51097653\n1.51097653P\n0051384034*51384034* 40083897* 40078422**\n1.51097653P";
if (preg_match_all('~\d{8}(?!\d)\*{0,2}(?!\*)~', $s, $matches)) {
    print_r(array_unique($matches[0]));
}

Output:

Array
(
    [0] => 40083897*
    [1] => 40058061*
    [2] => 51097653
    [4] => 51384034*
    [7] => 40078422**
)
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