PHP 条件字符串替换 str_replace [英] PHP conditional string replacement str_replace

问题描述

这是我试图用-"替换单词之间的空格的字符串.

This is the string i'm trying to replace white spaces between the words with "-".

$mystring = "Color red, Color blue, Color black";
$newstring = str_replace(' ', '-', $mystring);

我想使用 str_replace 函数实现的是:

What i want to achieve, using the str_replace function, is:

"Color-red, Color-blue, Color-black";

但这会返回:

"Color-red,-Color-blue,-Color-black";

我想我需要一个条件来替换不在逗号之后"或在两个单词之间"的空格.但我不知道.有什么建议吗?

I guess i need a condition that replaces white spaces "not after the comma" or "between two words". But i have no idea. Any suggestion?

推荐答案

(?

使用 负向后视来匹配所有空格(\s) 后面没有 ,.

That uses a negative lookbehind to match all spaces (\s) that aren't followed by a ,.

preg_replace("/(?<!,)\s/", '-', $mystring);

在这里玩正则表达式.

这篇关于PHP 条件字符串替换 str_replace的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！