CODEWITHSUNDEEP
phpregex
user3713783
user3713783

Reputation: 1

Regex PHP preg_match priority

I have this code

if (preg_match('/J[a-zA-Z0-9]+S/', $id)) {  
    echo "1";
}
else if (preg_match('/BUT[a-zA-Z0-9]+TN/', $id)) {  
    echo "2";
}

I have the id as BUTEqHLHxJSRr9DJZSMTN, Instead of getting 2 as output, I am getting 1. This is has BUTEqHLHxJSRr9DJZSMTN which is making it match with the first expression. But this exp also has BUT/TN and it should also match with that regex also right?

Is there any way I can make the regex pattern in such a way that it do not check for matches from the middle of an expression, but rather it should match the beginning and end.

I don't know whether this is a stupid question to ask,but is there anyway its possible to prevent pregmatch to match from the begining?

Upvotes: 0

Views: 392

Answers (3)

hwnd
hwnd

Reputation: 70732

You can use the ^ (beginning of string), $ (end of string) anchors to match an entire string. For example, this will give you the result of 2 seeing how it matches the entire string from start to end.

$id = 'BUTEqHLHxJSRr9DJZSMTN';

if (preg_match('/^J[a-zA-Z0-9]+S$/', $id)) { echo "1"; }
else if(preg_match('/^BUT[a-zA-Z0-9]+TN$/', $id)) { echo "2"; }

Upvotes: 3

Rakesh Sharma
Rakesh Sharma

Reputation: 13728

try ^ then it will check must be start from given string

   if(preg_match('/^J[a-zA-Z0-9]+S/', $id)) { 
        echo "1";
   }
   else if(preg_match('/^BUT[a-zA-Z0-9]+TN/', $id)) {   
        echo "2";
   }

Upvotes: 0

anubhava
anubhava

Reputation: 785611

Use word boundaries to avoid matching unwanted text:

if(preg_match('/\bJ[a-zA-Z0-9]+S\b/', $id)) { 
    echo "1";
}
else if(preg_match('/\bBUT[a-zA-Z0-9]+TN\b/', $id)) {   
    echo "2";
}

Upvotes: 0

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