Question

我想将文字<b>^FTest</b>转换为<div class="import">FTest</div>，这样只有匹配并替换了开始标记时才会匹配和替换结束标记。

更简单的类比：如何轻松切换以下内容：

This is a "simple" test, yes, a "simple" test, that's right a "simple" test.
This is a [simple] test, yes, a [simple] test, that's right a [simple] test.
This is a **simple** test, yes, a **simple** test, that's right a **simple** test.
This is a <b>simple</b> test, yes a <b>simple</b> test, that's right a <b>simple</b> test.

Answer 1

以下PHP函数应该足够了：

function replacepairs($start, $end, $newstart, $newend, $string) {
  $changed = 1;
  while ($changed == 1) {
    $changed = 0;
    $startpos = strpos($string, $start);
    if ($startpos !== FALSE) {
      $endpos = strpos($string, $end, $startpos + strlen($start));
      if ($endpos !== FALSE) {
        $stringltstart = 0;
        $stringltlength = $startpos - $stringltstart;
        $stringlt = substr($string, $stringltstart, $stringltlength);
        $stringeqstart = $startpos + strlen($start);
        $stringeqlength = $endpos - $stringeqstart;
        $stringeq = substr($string, $stringeqstart, $stringeqlength);
        $stringgtstart = $endpos + strlen($end);
        $stringgtlength = strlen($string) - $stringgtstart;
        $stringgt = substr($string, $stringgtstart, $stringgtlength);
        $string = $stringlt.$newstart.$stringeq.$newend.$stringgt;
        $changed = 1;
      }
    }
  }
  return $string;
}

$string = 'This is a "simple" test, yes, a "simple" test, that\'s right a "simple" test.';
echo $string.'<br>'."\n";
$string = replacepairs('"', '"', '[', ']', $string);
echo $string.'<br>'."\n";
$string = replacepairs('[', ']', '**', '**', $string);
echo $string.'<br>'."\n";
$string = replacepairs('**', '**', '<b>', '</b>', $string);
echo $string.'<br>'."\n";

如何成对替换引号或标签等文本？

1 个答案: