I am not well versed on regular expressions, but have fumbled through
enough to come up with these three preg_replace() statements (I'm not
even sure how the third one works, but it does)to reduce a form field
value to the '(###) ###-####' U.S. phone format. My question, can I
combine them into one?

$phone=preg_replace('/\D/','',$text); // strip all non-digits
$phone=preg_replace('/^[0-1]/','',$text); // strip leading 0 or 1
$phone=preg_replace('/\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-.
]?([0-9]{4})/', '(\1) \2-\3', $text);

William Gill wrote:
> I am not well versed on regular expressions, but have fumbled through
> enough to come up with these three preg_replace() statements (I'm not
> even sure how the third one works, but it does)to reduce a form field
> value to the '(###) ###-####' U.S. phone format. My question, can I
> combine them into one?
>
> $phone=preg_replace('/\D/','',$text); // strip all non-digits
> $phone=preg_replace('/^[0-1]/','',$text); // strip leading 0 or 1
> $phone=preg_replace('/\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-.
> ]?([0-9]{4})/', '(\1) \2-\3', $text);

no problem:

<?php

// only 10 digits plus 0 or 1 at begin
$phone1="sf fd f0 (1-2-3) - 45 6 - 7 89-0 ff";
$phone2=$phone1;

// two expression example
$phone2=preg_replace('/^(\\d{3})(\\d{3})(\\d{4})$/','(\\1) \\2-\\3',
preg_replace('/(?:^\\D*[01]|\\D)/','',$phone2));

echo $phone2."\n";

// one expression example
$phone1=preg_replace('/^\\D*[01]?'.str_repeat('\\D*(\\d)',10).'\\D*$/','(\\1\\2\\3)
\\4\\5\\6-\\7\\8\\9\\10',$phone1);

echo $phone1."\n";

?>

Alexey Kulentsov wrote:

> no problem:
>
> <?php
>
> // only 10 digits plus 0 or 1 at begin
I am removing 0 and 1 from the beginning because 1) I don't need to
store 1 + phonenumber, just phonenumber, and 2) no valid area code
begins with 0 or 1.

> $phone1="sf fd f0 (1-2-3) - 45 6 - 7 89-0 ff";

What is this? and where do you use it? It just produces the string "sf
fd f0 (1-2-3) - 45 6 - 7 89-0 ff" which I don't see you use anywhere.

> $phone2=$phone1;
>
> // two expression example
> $phone2=preg_replace('/^(\\d{3})(\\d{3})(\\d{4})$/','(\\1) \\2-\\3',
> preg_replace('/(?:^\\D*[01]|\\D)/','',$phone2));
>
> echo $phone2."\n";
>
> // one expression example
> $phone1=preg_replace('/^\\D*[01]?'.str_repeat('\\D*(\\d)',10).'\\D*$/','(\\1\\2\\3)
> \\4\\5\\6-\\7\\8\\9\\10',$phone1);
>
doesn't seem to work for me. I realized my example was wrong:

$phone=preg_replace('/\D/','',$text); // strip all non-digits
$phone=preg_replace('/^[0-1]/','',$text); // strip leading 0 or 1
$phone=preg_replace('/\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-.
]?([0-9]{4})/', '(\1) \2-\3', $text);

should have been:

$phone=preg_replace('/\D/','',$text); // strip all non-digits
$phone=preg_replace('/^[0-1]/','',$phone); // strip leading 0 or 1
$phone=preg_replace('/\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-.
]?([0-9]{4})/', '(\1) \2-\3', $phone);


> echo $phone1."\n";
>
> ?>

William Gill wrote:
>> $phone1="sf fd f0 (1-2-3) - 45 6 - 7 89-0 ff";
>
> What is this? and where do you use it? It just produces the string "sf
> fd f0 (1-2-3) - 45 6 - 7 89-0 ff" which I don't see you use anywhere.

This it phone number with some junk inside to test example. Output is
(123) 456-7890
(123) 456-7890

> doesn't seem to work for me. I realized my example was wrong:
I always test my examples before posting. Did you try just copy
example from post and run it?

Alexey Kulentsov wrote:
> William Gill wrote:
>>> $phone1="sf fd f0 (1-2-3) - 45 6 - 7 89-0 ff";
>>
>> What is this? and where do you use it? It just produces the string "sf
>> fd f0 (1-2-3) - 45 6 - 7 89-0 ff" which I don't see you use anywhere.
>
> This it phone number with some junk inside to test example. Output is

Somehow I missed that.

>> doesn't seem to work for me. I realized my example was wrong:
> I always test my examples before posting. Did you try just copy example
> from post and run it?

I must have cut and pasted wrong, because now when I c&p into a fresh
file it works, thanks.