php Regular Expression return specific string

Question

Let us say, I want to return a name:

$re = "/(name is )[a-z- ]*( )/i";
$str = "My name is John ";

preg_match($re, $str, $matches);

print_r($matches);

The result is:

Array
(
    [0] => name is John 
    [1] => name is 
    [2] =>  
)

Well, let's see this:

$string = "My name is John and I like Ice-cream";
$pattern = "My name is $1 and I like $2";

With this I get: Array

(
    [0] => name is John and I like Ice-cream 
    [1] => name is 
    [2] =>  and I like 
    [3] =>  
)

which is more or less the same string I passed.

What I am looking for is to compare and extract the variables so that I could use them as variable $1 and $2 or anything like this works.

Or maybe a method that returns an associate array or those items like:

Array("1" => "John" , "2" => "Ice-cream")

Any workaround or ideas are highly appreciated as long as they work in the way I asked above.

You didn't put a capturing group around the name. If you did your result array would provide enough information from which you could derive the array you want. — Marty
– Marty, Commented Nov 11, 2015 at 10:13
@Marty, what about the case with multiple items? Any code to share? — X Pahadi
– X Pahadi, Commented Nov 11, 2015 at 10:15

syck · Accepted Answer · 2015-11-11 12:52:32Z

3

$str = 'My name is John and I like Ice-cream';
$re = '/My name is (\S+) and I like (\S+)/';
preg_match($re, $str, $matches);

print_r($matches);

returns

Array
(
    [0] => My name is John and I like Ice-cream
    [1] => John
    [2] => Ice-cream
)

\\S matches non-whitespace.

Change it to . to match anything, which will work as far as the other strings in the pattern ("My name is " and " I like ") are fixed.

edited Nov 11, 2015 at 12:52

answered Nov 11, 2015 at 10:17

syck

3,0391 gold badge15 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

14 Comments

Arjan Over a year ago

You don't need to escape the `` in your regex. And this will fail if a name contains whitespace or if the think you like does.

X Pahadi Over a year ago

Awesome. I guess I can take the boat from here.

syck Over a year ago

@arjan Added a some text concerning the whitespace issue. However, the thing about escaping I do not understand.

X Pahadi Over a year ago

Umm, @Arjan, this will fail if a name contains whitespace yes that's true. But, is there a way to overcome?

Arjan Over a year ago

@syck Concerning the whitespace, I would simply use .* or .+ to match any characters.

|

X Pahadi · Accepted Answer · 2015-11-11 10:57:47Z

1

Not so clean but might be helpful...

$string = "My name is John Cena and I like Ice-cream";
$pattern = "My name is $ and I like $";
print_r(getArray($string, $pattern));

function getArray($input, $pattern){

    $delimiter = rand();
    while (strpos($input,$delimiter) !== false) {
        $delimiter++;
    }

    $exps = explode("$",$pattern);
    foreach($exps as $exp){
        $input = str_replace($exp,",", $input);
    }

    $responses = explode(",", $input);
    array_shift($responses);
    return $responses;

}

It returns:

Array
(
    [0] => John Cena
    [1] => Ice-cream
)

edited Nov 11, 2015 at 10:57

X Pahadi

7,4715 gold badges57 silver badges83 bronze badges

answered Nov 11, 2015 at 10:28

met.lord

6182 gold badges10 silver badges35 bronze badges

Collectives™ on Stack Overflow

php Regular Expression return specific string

2 Answers 2

14 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

14 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related