PHP字符串替换匹配整个单词 [英] PHP string replace match whole word

问题描述

我想使用php替换完整的单词

I would like to replace just complete words using php

示例: 如果我有

$text = "Hello hellol hello, Helloz";

我用

$newtext = str_replace("Hello",'NEW',$text);

新文字应为

NEW hello1 hello，Helloz

NEW hello1 hello, Helloz

PHP返回

NEW hello1 hello，NEWz

NEW hello1 hello, NEWz

谢谢.

推荐答案

您要使用正则表达式. \b与单词边界匹配.

You want to use regular expressions. The \b matches a word boundary.

$text = preg_replace('/\bHello\b/', 'NEW', $text);

---

如果$text包含UTF-8文本，则必须添加Unicode修饰符"u"，以便不会将非拉丁字符误解为单词边界:

---

If $text contains UTF-8 text, you'll have to add the Unicode modifier "u", so that non-latin characters are not misinterpreted as word boundaries:

$text = preg_replace('/\bHello\b/u', 'NEW', $text);

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