Preg Match Extracting

Question

I want to extract a string out of a string.

I have the following String:

"date-x-days"

I would like to extract the "x", which could be any int value

I already tried this pattern: ~(date-)*(-days)~ But its only giving me "date-" and "-days" back, but I want to receive the number.

How can I do this?

Cheers, Niklas

You wrote a pseudo pattern of your string and defined what exactly what you want from that string, which is very good! You also tried to do it yourself with the knowledge you have! Now as a next step you can put your regex into here: https://regex101.com/ and check out what exactly your regex currently does. You also can check out this Q&A: http://stackoverflow.com/q/6278296/3933332 and use it to modify your current regex. — Rizier123, Apr 22 '16 at 10:40
`sscanf("date-345-days","date-%d-days", $days); echo $days;` — Gordon, Apr 22 '16 at 11:27

score 2 · Answer 1 · answered Apr 22 '16 at 10:48

2

It can simply done by explode function. try below code

$arr = explode('-','[date-x-days]');
echo $arr[1];

answered Apr 22 '16 at 10:48

sandeep soni

303
1
12

score 0 · Accepted Answer · answered Apr 22 '16 at 10:55

0

$returnValue = preg_match('/-(\d+)-/', '[date-454-days]', $matches);
print_r($matches);

answered Apr 22 '16 at 10:55

ssnake

365
2
14

This is nearly good, thanks!! - but in my string there is more text behind the [date-3-days] - is it possible to integrate the date- and -days in to the pattern? – Niklas Riecken Apr 22 '16 at 11:04
try this pattern: `'/date-(\d+)-days/'` – ssnake Apr 22 '16 at 11:07

Andreas · Answer 3 · 2016-04-22T11:12:18.180

With this pattern you will catch each part of the string as a new value, so if you need to edit something you can easily do that.

preg_match("/(date)-(\d+)-(days)/", "date-45-days", $output_array);
echo $output_array[2]; //45

Var_dump(output_array);//= 
array(4
   0    =>  date-35-days
   1    =>  date
   2    =>  35
   3    =>  days
)

See it here: http://www.phpliveregex.com/p/frp as you can see it only catches if all parts are there in order.

Preg Match Extracting

3 Answers3