preg_match 表单内输入字段的名称

Question

抱歉，我花了将近 2 个小时来 preg_match 这个表格

<form class="form-search" method="post" action="/index.php">
  <div class="form-group">
    <input id="address_box" type="text" class="form-control" name="x" value="" onfocus="this.select()" />
  </div>
<span class="btn btn-s btn-caps"><input type="submit" value="start" /></span>
</form>

收件人：

Preg_match:

START = <form

WHERE action CONTAIN /index.php
EX: action="/index.php" or action="http://whatever.com/index.php"

FIND name="[A-Za-z]{1}"

END = </form>

Then Output the [A-Za-z]{1} Match (Should get x)

请问如何正确操作？

谢谢。

Answer 1

$pat = /\/index.php\">.*?form-control\".*(?<=name=\")([A-Za-z]{1})(?=\")/s

$sub = '<form class="form-search" method="post" action="/index.php">
  <div class="form-group">
    <input id="address_box" type="text" class="form-control" name="x" value="" onfocus="this.select()" />
  </div>
<span class="btn btn-s btn-caps"><input type="submit" value="start" /></span>
</form>';

preg_match($pat,$sub,$match);


to echo mateched use echo $match[1];

Answer 2

好的，这个正则表达式应该可以完成工作：

$regex = '/<form.*(?<=action=\")?\/index.php\">.*(?<=name=\")([A-Za-z]{1})(?=\").*?<\/form>/s';

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