Regex to catch 14 digits number that starts with 25 within a text string

Asked Oct 14 '19 at 18:09

Active Oct 14 '19 at 18:09

Viewed 15 times

I have created a regex that catches only numbers that are 14 digits long and start with 25, which works correctly.

if (preg_match('/(?=\d{14}$)(25)\d+/', $valid_id)){
    $return_value = 1;
}

If I type something before the number it works fine. However, as soon as I write something (space, letter, digit) after the number the regex stops working and no longer catches it.

For example:

$valid_id = "the id is 25000000000000";

It catches the number, but if I write

$valid_id = "the id is 25000000000000 and it is valid";

Then it doesnt.

I presume I am missing something at the end of the regex, but cant figure it out.

asked Oct 14 '19 at 18:09

lStoilov

1,256
3
14
30

1

Word boundaries are used to match whole words, `'/\b(?=\d{14}\b)25\d+/'`. You may also write it as `'/\b25\d{12}\b/'`. And then consider other types of boundaries: `'/(?<!\S)25\d{12}(?!\S)/'`, `'/(?<!\d)25\d{12}(?!\d)/'`, etc. – Wiktor Stribiżew Oct 14 '19 at 18:11
Thanks, it worked.! – lStoilov Oct 14 '19 at 18:16
1

You are very welcome :) – Wiktor Stribiżew Oct 14 '19 at 18:18

Regex to catch 14 digits number that starts with 25 within a text string

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