CODEWITHSUNDEEP
phpregex
user123
user123

Reputation: 5407

matching first three numbers in regex

I have regex to match the US numbers:

\(?[2-9][0-8][0-9]\)?[-. ]?[0-9]{3}[-. ]?[0-9]{4}

Though I check first three digits as us numbers, I have few area code and want to filter numbrs with this area code only. 

$area_code = array(201,202,203,2,04);

Number having first three digits among this array value should only allowed. what modification regex required?

Upvotes: 0

Views: 459

Answers (2)

Amal Murali
Amal Murali

Reputation: 76656

Use implode() to join the numbers together with the delimiter | and use it in your regex pattern:

$area_code = array(201,202,203,204);
$p = implode('|', $area_code);
$pattern = '/\(?(?:'.$p.')\)?[-. ]?[0-9]{3}[-. ]?[0-9]{4}/';

The resulting regex would look like:

\(?(?:201|202|203|2|4)\)?[-. ]?[0-9]{3}[-. ]?[0-9]{4}

Which would match the number if they begin with one of the values in the in the $area_code array. The advantage of this approach over the other one is that this'd let you add custom numbers that doesn't follow any specific pattern. The downside is that it can get slow if there lots of numbers in your array.

Regex101 Demo

Upvotes: 1

Sharanya Dutta
Sharanya Dutta

Reputation: 4021

The following regular expression should serve your purpose:

\(?20[1-4]\)?[-. ]?[0-9]{3}[-. ]?[0-9]{4}

Upvotes: 1

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