Question

我试图将遇到大写字母的每个字符放在前面。我实现的是：

$str =  "Rating: goodHelps control sebum production Rating: averagePrevents the development of microorganisms in cosmetics Rating: badCan be allergenic Rating: badToxic to cell division"; 
$string = preg_replace('/([a-z])([A-Z])/', "</br>", $str);

print_R($string);

结果：

评分：go

麋鹿控制皮脂的产生评分：平均

避免化妆品中微生物的生长等级：ba

防过敏等级：ba

对细胞分裂有毒

如您所见，它删除了第一个和第二个字符。我需要带。

的全文

Answer 1

您想使用反向引用替换中捕获的内容。第一个捕获组()是$1，第二个捕获组是$2：

$string = preg_replace('/([a-z])([A-Z])/', '$1</br>$2', $str);

Answer 2

您可以使用环视功能，这会在小写和大写字符之间插入</br>。

$str =  "Rating: goodHelps control sebum production Rating: averagePrevents the development of microorganisms in cosmetics Rating: badCan be allergenic Rating: badToxic to cell division"; 
echo preg_replace('/(?<=[a-z])(?=[A-Z])/', "</br>", $str);

输出：

Rating: good</br>Helps control sebum production Rating: average</br>Prevents the development of microorganisms in cosmetics Rating: bad</br>Can be allergenic Rating: bad</br>Toxic to cell division

PHP <br/>，其中小写字母与大写字母

2 个答案: