仅当字符串为搜索时才替换字符串(preg_replace多字节) [英] Replace String only if string is search (preg_replace multibyte)

问题描述

我有问题.我只想替换某些与我键入的字符串完全相同的字符串.因此，如果字符串中带有5 Eur，则只能用例如Steam 5 Euro，如果他是一个人，而不是字符串是How are you 5 Eur pls.

使用我的实际代码，这是不可能的...我使用例如:

$string = str_replace('Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro', $string)

因为此处字符串包含25 Eur，所以此代码还添加了一些内容:

$string = str_replace('25 Eur', 'Steam 25 Euro', $string);

但是如果我想使用preg_replace(/\b25 Eur\b/i)，则会出现此错误:

PHP警告:preg_replace():中的未知修饰符'.'

所以我有两个问题:

1. 如何使用多字节替换功能?

2. 我如何才能告诉此函数仅替换一个单独的字符串(如果他是一个字符串)而不替换一个包含搜索到的字符串的字符串?

问候和谢谢！

解决方案

这应该有效.

搜索依据:

^(25 Eur)$

替换为:

Steam 25 Euro

输入:

Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro
25 Eur

输出:

Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro
Steam 25 Euro

PHP代码:

<?php
$re = '/^(25 Eur)$/m';
$str = 'Apple Itunes 25 Euro Guthaben Prepaid De\', \'Apple iTunes 25 Euro
25 Eur';
$subst = 'Steam 25 Euro';

$result = preg_replace($re, $subst, $str);

echo "The result of the substitution is ".$result;

请参阅: https://regex101.com/r/3DKEas/2

I have a problem. I want to replace certain strings only if they are exactly like I typed. So if there is a string with 5 Eurhe should only be replaced with e.g. Steam 5 Euro, if he stands alone and not if the string is like How are you 5 Eur pls.

With my actual code this is not possible... I use e.g.:

$string = str_replace('Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro', $string)

Because here the string contains 25 Eur this code is also adding some stuff:

$string = str_replace('25 Eur', 'Steam 25 Euro', $string);

But if I want to use preg_replace(/\b25 Eur\b/i) I get this error:

PHP Warning: preg_replace(): Unknown modifier '�' in

So I have two questions:

1. How can I use an multibyte replace function?

2. How can I tell this function only to replace a certain string if he stands alone and not if he contains the searched string?

Greetings and Thank You!

解决方案

This Should Work.

Search by:

^(25 Eur)$

Replace with:

Steam 25 Euro

Input:

Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro
25 Eur

Output:

Apple Itunes 25 Euro Guthaben Prepaid De', 'Apple iTunes 25 Euro
Steam 25 Euro

PHP Code:

<?php
$re = '/^(25 Eur)$/m';
$str = 'Apple Itunes 25 Euro Guthaben Prepaid De\', \'Apple iTunes 25 Euro
25 Eur';
$subst = 'Steam 25 Euro';

$result = preg_replace($re, $subst, $str);

echo "The result of the substitution is ".$result;

See: https://regex101.com/r/3DKEas/2

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