正则

$pi = "/(\w{4})(\d{3})-(\d{4})(\w{2})(\d{1}?)-(2)/x";$phones ="Call555-1212or1-800-555-1212";echo preg_match($pi,$phones)? "1": "2";

$pi = "/(\w{4})(\d{3})-(\d{4})(\w{2})(\d{1}?)-/x";$phones ="Call555-1212or1-800-555-1212";echo preg_match($pi,$phones)? "1": "2";

回复讨论(解决方案)

$pi = "/(\w{4})(\d{3})-(\d{4})(\w{2})(\d{1}?)-/x";
匹配到的是
Array
(
[0] => Call555-1212or1-
[1] => Call
[2] => 555
[3] => 1212
[4] => or
[5] => 1
)

如果加上 (2)
则需要 $phones ="Call555-1212or1- 800-555-1212"; 中套红的位置为 2 才能匹配成功

$pi = "/(\w{4})(\d{3})-(\d{4})(\w{2})(\d{1}?)-/x";
匹配到的是
Array
(
[0] => Call555-1212or1-
[1] => Call
[2] => 555
[3] => 1212
[4] => or
[5] => 1
)

如果加上 (2)
则需要 $phones ="Call555-1212or1- 800-555-1212"; 中套红的位置为 2 才能匹配成功
有点不理解你的意思！

$pi = "/(\w{4})(\d{3})-(\d{4})(\w{2})(\d{1}?)-/x";
匹配到的是
Array
(
[0] => Call555-1212or1-
[1] => Call
[2] => 555
[3] => 1212
[4] => or
[5] => 1
)

如果加上 (2)
则需要 $phones ="Call555-1212or1- 800-555-1212"; 中套红的位置为 2 才能匹配成功
（2）不就是(\d{3})！而且我试过给他命一个名然后调用也不对！只能是位置的问题！但是我找不出原因啊！

(2) 表示匹配字符 2，并可向后引用
如果你想引用 (\d{3}) 则需要写作 \\2

(2) 表示匹配字符 2，并可向后引用
如果你想引用 (\d{3}) 则需要写作 \\2
$pi = "/(\w{4})(?\d{3})-(\d{4})(\w{2})(\d{1}?)-(\k)/x";
请问这样写对吗？

(2) 表示匹配字符 2，并可向后引用
如果你想引用 (\d{3}) 则需要写作 \\2
好像还是匹配不了、

不管其他写什么 -2 在你的字串里就肯定没有，-(2)就必然匹配不到