Regex帮助(PHP)在两个字符串之间查找和选择字符

preg_match("/test(.*?)end/s", $yourString, $matches);
print_r($matches);

你可以用两个 lookarounds 以及 /s (单线) modifier dot 匹配新行,寻找两个单词之间的所有内容:

/(?<=test).*(?=end)/s

(?<=    # open a positive lookbehind
  test  # match 'test'
)       # close the lookbehind
.*      # match as many characters as possible (including newlines because of the \s modifier)
(?=     # open a positive lookahead
 end    # match 'end'
)       # close the lookahead

lookarounds将允许您断言模式必须由您的两个单词锚定,但是由于lookarounds没有捕获,因此只有单词之间的所有内容将由 preg_match . 一个旁观者看 判断断言是否通过的当前位置;向前看 当前位置。

greedy 默认情况下 .* end .* lazy (换句话说,它将匹配 通过将其更改为 .*? (即。 /(?<=test).*?(?=end)/s

$arr1 = explode("test",$input);
$arr2 = explode("end",$arr1[1]);
$result = $arr2[0];

$str = 'iojge test rgej <foo>
ferfe 098n34hjlrej
fefe <end';
$start = 'test';
$end = 'end';
if (($startPos = strpos($str, $start)) !== false && ($endPos = strpos($str, $end, $startPos+=strlen($start))) !== false) {
    // match found
    $match = substr($str, $startPos, $endPos-$startPos);
}