PHP 7.3 upgrade to PCRE2 performance test

re_bench.php

<?php


### run this with php 7.3 and php lower version such as php 7.2
### time php re_bench.php 
### time php73 re_bench.php

$regex_list = [
    '#Twain#',
    '#(?i)Twain#',
    '#[a-z]shing#',
    '#Huck[a-zA-Z]+|Saw[a-zA-Z]+#',
    '#\b\w+nn\b#',
    '#[a-q][^u-z]{13}x#',
    '#Tom|Sawyer|Huckleberry|Finn#',
    '#(?i)Tom|Sawyer|Huckleberry|Finn#',
    '#.{0,2}(Tom|Sawyer|Huckleberry|Finn)#',
    '#.{2,4}(Tom|Sawyer|Huckleberry|Finn)#',
    '#Tom.{10,25}river|river.{10,25}Tom#',
    '#[a-zA-Z]+ing#',
    '#\s[a-zA-Z]{0,12}ing\s#',
    '#([A-Za-z]awyer|[A-Za-z]inn)\s#',
    '#["\'][^"\']{0,30}[?!\.][\"\']#',
    //'#\u221E|\u2713#',  // 这里注释掉是因为在 PHP7.3之前还不支持这种语法
    '#\p{Sm}#',
];



$file_content_list = [];

$files = [
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '32.txt',
    '1K.txt',
    '1K.txt',
    '1K.txt',
    '1K.txt',
    '1K.txt',
    '1K.txt',
    '1K.txt',
    '32K.txt',
    '32K.txt',
    '32K.txt',
    '1MB.txt',
];

// path to regex data, @see https://github.com/rust-lang/regex/tree/master/bench/src/data
$prefix = '$rust-lang-dir/regex/regex/bench/src/data';

foreach ($files as $_f) {
    $_path = $prefix . '/' . $_f;
    $file_content_list[] = file_get_contents($_path);
}


foreach ($regex_list as $_r) {
    foreach ($file_content_list as $_content) {
        $match_num = preg_match($_r, $_content, $matches);
    }
}