提取关键字该单词模式 - Extract keyword that Word Pattern

Extract keyword that Word Pattern

本文关键字：模式单词关键字提取 | 更新日期: 2023-09-27

我有一个字符串。

hi {$USER_NAME} THIS IS THE TEST MSG FOR {$USER1,$USER2,$USER3}

我想从字符串中提取所有{$word}。我尝试使用str_replace但它不起作用。

具有preg_mach_all函数的简短解决方案：

$str = 'hi {$USER_NAME} THIS IS THE TEST MSG FOR {$USER1,$USER2,$USER3}';
preg_match_all('/'s*('{'$[^'{'}]+'})+'s*/iue', $str, $matches);
echo "<pre>";
var_dump($matches[1]);
// the output:
array(2) {
  [0]=>
  string(12) "{$USER_NAME}"
  [1]=>
  string(22) "{$USER1,$USER2,$USER3}"
}

http://php.net/manual/ru/function.preg-match-all.php

$string = 'hi {$USER_NAME} THIS IS THE TEST MSG FOR {$USER1,$USER2,$USER3}';
$variableRegexp = '[a-zA-Z_'x7f-'xff][a-zA-Z0-9_'x7f-'xff]*';
$repeatedVariableRegex = $variableRegexp . '(?:,'s*?'$' . $variableRegexp . ')*';
preg_match_all('/'{'$' . $repeatedVariableRegex . ''}/', $string, $matches);
var_dump($matches);

输出将是：

array(1) {
  [0] =>
  array(2) {
    [0] =>
    string(12) "{$USER_NAME}"
    [1] =>
    string(22) "{$USER1,$USER2,$USER3}"
  }
}