如何在PHP中使用开始和结束字符获取字符串的子字符串？

Question

I am looking for finding middle part of a string using starting tag and ending tag in PHP.

$str = 'Abc/[e-mail]/1267890(A-29)';
$agcodedup = substr($str, '(', -1);
$agcode = substr($agcodedup, 1);

final expected value of agcode:

$agcode = 'A-29';

Answer 1

You can use preg_match

    $str = 'Abc/[e-mail]/1267890(A-29)';
    if(  preg_match('/\(([^)]+)\)/', $string, $match ) ) echo $match[1]."

";

Outputs

   A-29

You can check it out here

http://sandbox.onlinephpfunctions.com/code/5b6aa0bf9725b62b87b94edbccc2df1d73450ee4

Basically Regular expression says:

• start match, matches \( Open Paren literal
• capture group ( .. )
• match everything except [^)]+ Close Paren )
• end match, matches \) Close Paren literal

Oh and if you really have your heart set on substr here you go:

$str = 'Abc/[e-mail]/1267890(A-29)';

//this is the location/index of the ( OPEN_PAREN
//strlen 0 based so we add +1 to offset it
$start = strpos( $str,'(') +1;
//this is the location/index of the ) CLOSE_PAREN.
$end = strpos( $str,')');
//we need the length of the substring for the third argument, not its index
$len = ($end-$start);  

echo substr($str, $start, $len );

Ouputs

A-29

And you can test this here

http://sandbox.onlinephpfunctions.com/code/88723be11fc82d88316d32a522030b149a4788aa

If it was me, I would benchmark both methods, and see which is faster.