PHP preg_match for getting a string part after the given optional substrings

Question

I have several urls such as below and those contains -XX- letter and following xxxxxxxxx key in the end of the url.

http://vayes-eys.dev/shoe-for-ladies/high-hields/7-pont-with-silver-stripes-PD-0a8564q56

or

http://vayes-eys.dev/news/europe/england/cricket-news/josh-darpant-is-on-the-way-to-rome-NS-e3q3s2wq4q

What I want to do is; first to check if -NS-, -PD- or -SP- exist in url, then get the -XX- part and the part after it,for example: e3q3s2wq4q.

What I have done so far is:

$path = "shoe-for-ladies/high-hields/7-pont-with-silver-stripes-PD-0a8564q56"

if (preg_match('/-PD-|-NS-|-SP-/',$path)) {
    preg_match("/(?<=(-PD-|-NS-|-SP-)).*/", $path, $match);
    print_r($match);
}

This gives me the following array but I am not sure if it is the right way.

array(
    0 => 0a8564q56
    1 => -PD-
)

What I need is PD and 0a8564q56. Thanks for any help.

Use -(NS|PD|SP)-(\w+) in preg_match_all use both captured groups. — anubhava
– anubhava, Commented Sep 6, 2016 at 14:49
Why the 2 preg_matchs. Just put the second one in the conditional. — chris85
– chris85, Commented Sep 6, 2016 at 14:51
There's no need to use preg_match twice, build a pattern with capture groups to extract informations you want. — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Sep 6, 2016 at 14:51
@anubhava if(preg_match_all('/-(NS|PD|SP)-(\w+)/', $path, $match)) { print_r($match); } working nicely. Thank you. — YahyaE
– YahyaE, Commented Sep 6, 2016 at 15:08

Wiktor Stribiżew · Accepted Answer · 2016-09-06 14:49:38Z

2

You may use

'~-(NS|PD|SP)-([^-/]+)~'

or

'~-(NS|PD|SP)-([A-Za-z0-9]+)~'

See the regex demo

Details:

- - a literal hyphen
(NS|PD|SP) - Group 1 capturing one of the values: NS, PD or SP
- - a hyphen
([^-/]+) - 1 or more characters other than - and / (the delimiters). If you only have letters and digits there, you may just use [a-zA-Z0-9]+ instead.

PHP demo:

$path = "shoe-for-ladies/high-hields/7-pont-with-silver-stripes-PD-0a8564q56";
preg_match('~-(NS|PD|SP)-([A-Za-z0-9]+)~', $path, $match);
print_r($match);

Your values are in Group 1 and 2.

answered Sep 6, 2016 at 14:49

Wiktor Stribiżew

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5 Comments

YahyaE Over a year ago

Stribizew, I works nicely, Thank you. Two question: One of the friends here suggested (\w+) for the second group. What's difference with your ([^-/]+)..

YahyaE Over a year ago

Maybe one more, if you have time. Can we get also the part before -NS- at the same preg_match?

Wiktor Stribiżew Over a year ago

Is that part optional? What should it look like if you have the input as in my code snippet? 7-pont-with-silver-stripes or stripes?

chris85 Over a year ago

@YahyaE You can use the regex101 provided link to alter the regex and see how it functions with the alterations. Here's an update with the \w+ regex101.com/r/vC2fI1/2. The site also provides a description of each part on the right side. \w+ is any alpha character, number, or under score. [^-/]+ is any non - or -.

YahyaE Over a year ago

@WiktorStribiżew That part is not optional. http://abc.ltd/<group1>-<NS|PD>-<group3> or http://abc.ltd/sth/smw/smo/<last-segment>-<NS|PD>-<group3>. I can use both.

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