正则表达式找到大写和小写以及任何派生单词

Question

我想删除字符串中的word：

Word , WOrd , WORd , wORd , word , WoRd

我研究过它，但找不到实现这个目标的方法。如何为此编写正则表达式？

Answer 1

请参阅PHP manual

中的以下示例

<?php
// The "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match("/php/i", "PHP is the web scripting language of choice.")) {
    echo "A match was found.";
} else {
    echo "A match was not found.";
}
?>

Answer 2

使用/i修饰符忽略大小写。

$input = preg_replace("/word/i", "", $input);

Answer 3

可能不是你想要的但是这里......

$words = "Word , WOrd , WORd , wORd , word , WoRd";
$wordArray = explode(",", $words);

foreach($wordArray  as $key=>$word){
    if($word==strtolower($word)){
        unset($wordArray[$key]);
    }
}