Mixing
@ in PHP regular expressions
I found this script for password validation, but I don't know, why is "@" inside patterns. Can you explain me it? Thanks
$uppercase = preg_match('@[A-Z]@', $_POST['password']);
$lowercase = preg_match('@[a-z]@', $_POST['password']);
$number = preg_match('@[0-9]@', $_POST['password']);
if (!$uppercase || !$lowercase || !$number || strlen($_POST['password']) < 8)
{
$message .= "Password must contains lowercase letter, uppercase letter, digit and minimal length is 8 characters. <br/>";
}
php regex validation
asked Jan 2 at 17:53
adamadam
236
|
show 1 more comment
I found this script for password validation, but I don't know, why is "@" inside patterns. Can you explain me it? Thanks
$uppercase = preg_match('@[A-Z]@', $_POST['password']);
$lowercase = preg_match('@[a-z]@', $_POST['password']);
$number = preg_match('@[0-9]@', $_POST['password']);
if (!$uppercase || !$lowercase || !$number || strlen($_POST['password']) < 8)
{
$message .= "Password must contains lowercase letter, uppercase letter, digit and minimal length is 8 characters. <br/>";
}
php regex validation
asked Jan 2 at 17:53
adamadam
236
php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
1
I don't agree with it, but they are using the@for delimiters instead of/for example
– ArtisticPhoenix
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as.or+or|etc. Sandbox
– ArtisticPhoenix
Jan 2 at 18:02
|
show 1 more comment
I found this script for password validation, but I don't know, why is "@" inside patterns. Can you explain me it? Thanks
$uppercase = preg_match('@[A-Z]@', $_POST['password']);
$lowercase = preg_match('@[a-z]@', $_POST['password']);
$number = preg_match('@[0-9]@', $_POST['password']);
if (!$uppercase || !$lowercase || !$number || strlen($_POST['password']) < 8)
{
$message .= "Password must contains lowercase letter, uppercase letter, digit and minimal length is 8 characters. <br/>";
}
php regex validation
asked Jan 2 at 17:53
adamadam
236
I found this script for password validation, but I don't know, why is "@" inside patterns. Can you explain me it? Thanks
$uppercase = preg_match('@[A-Z]@', $_POST['password']);
$lowercase = preg_match('@[a-z]@', $_POST['password']);
$number = preg_match('@[0-9]@', $_POST['password']);
if (!$uppercase || !$lowercase || !$number || strlen($_POST['password']) < 8)
{
$message .= "Password must contains lowercase letter, uppercase letter, digit and minimal length is 8 characters. <br/>";
}
php regex validation
php regex validation
asked Jan 2 at 17:53
adamadam
236
asked Jan 2 at 17:53
adamadam
236
asked Jan 2 at 17:53
adamadam
236
asked Jan 2 at 17:53
adamadam
236
asked Jan 2 at 17:53
adamadam
236
236
php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
1
I don't agree with it, but they are using the@for delimiters instead of/for example
– ArtisticPhoenix
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as.or+or|etc. Sandbox
– ArtisticPhoenix
Jan 2 at 18:02
|
show 1 more comment
php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
1
I don't agree with it, but they are using the@for delimiters instead of/for example
– ArtisticPhoenix
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as.or+or|etc. Sandbox
– ArtisticPhoenix
Jan 2 at 18:02
php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
1
1
I don't agree with it, but they are using the
@ for delimiters instead of / for example– ArtisticPhoenix
Jan 2 at 17:57
I don't agree with it, but they are using the
@ for delimiters instead of / for example– ArtisticPhoenix
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as
. or + or | etc. Sandbox– ArtisticPhoenix
Jan 2 at 18:02
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as
. or + or | etc. Sandbox– ArtisticPhoenix
Jan 2 at 18:02
|
show 1 more comment
1 Answer
1
active
oldest
votes
In many regex libraries, the "delimiter" is actually completely up to the programmer, and totally arbitrary. Basically, whatever the first char in the pattern is, that's the delimiter and when it shows up again (unescaped) the pattern is considered complete (optionally with some flags following the closing delimiter).
You can consider it a matter of programmer style/taste, or maybe they got in the habit on a project where the patterns needed / in the pattern and they didn't want to escape them all the time.
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
Thanks for answer.
– adam
Jan 2 at 18:20
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In many regex libraries, the "delimiter" is actually completely up to the programmer, and totally arbitrary. Basically, whatever the first char in the pattern is, that's the delimiter and when it shows up again (unescaped) the pattern is considered complete (optionally with some flags following the closing delimiter).
You can consider it a matter of programmer style/taste, or maybe they got in the habit on a project where the patterns needed / in the pattern and they didn't want to escape them all the time.
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
Thanks for answer.
– adam
Jan 2 at 18:20
add a comment |
In many regex libraries, the "delimiter" is actually completely up to the programmer, and totally arbitrary. Basically, whatever the first char in the pattern is, that's the delimiter and when it shows up again (unescaped) the pattern is considered complete (optionally with some flags following the closing delimiter).
You can consider it a matter of programmer style/taste, or maybe they got in the habit on a project where the patterns needed / in the pattern and they didn't want to escape them all the time.
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
Thanks for answer.
– adam
Jan 2 at 18:20
add a comment |
In many regex libraries, the "delimiter" is actually completely up to the programmer, and totally arbitrary. Basically, whatever the first char in the pattern is, that's the delimiter and when it shows up again (unescaped) the pattern is considered complete (optionally with some flags following the closing delimiter).
You can consider it a matter of programmer style/taste, or maybe they got in the habit on a project where the patterns needed / in the pattern and they didn't want to escape them all the time.
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
In many regex libraries, the "delimiter" is actually completely up to the programmer, and totally arbitrary. Basically, whatever the first char in the pattern is, that's the delimiter and when it shows up again (unescaped) the pattern is considered complete (optionally with some flags following the closing delimiter).
You can consider it a matter of programmer style/taste, or maybe they got in the habit on a project where the patterns needed / in the pattern and they didn't want to escape them all the time.
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
answered Jan 2 at 17:58
Chris TraheyChris Trahey
17.1k13251
17.1k13251
Thanks for answer.
– adam
Jan 2 at 18:20
add a comment |
Thanks for answer.
– adam
Jan 2 at 18:20
Thanks for answer.
– adam
Jan 2 at 18:20
Thanks for answer.
– adam
Jan 2 at 18:20
add a comment |
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php.net/manual/en/regexp.reference.delimiters.php
– Paul
Jan 2 at 17:56
Possible duplicate of stackoverflow.com/questions/2892749/…
– Nigel Ren
Jan 2 at 17:57
1
I don't agree with it, but they are using the
@for delimiters instead of/for example– ArtisticPhoenix
Jan 2 at 17:57
@, /, -, %, ` these are all delimiters. which represents the start and end of regex expression.
– Zia Ur Rehman
Jan 2 at 17:57
Technically you can use anything that is not alpha numeric can be a delimiter, including things that have meaning in regex, such as
.or+or|etc. Sandbox– ArtisticPhoenix
Jan 2 at 18:02