php在大写字母前的字符串中放置一个空格(Regex) [英] Php put a space in front of capitals in a string (Regex)

问题描述

我有很多包含单词的字符串，这些单词被捆在一起，我需要将它们分开.

I have a number of strings which contain words which are bunched together and I need to seperate them up.

例如 ThisWasCool-这很酷
MyHomeIsHere-我的家在这里

For example ThisWasCool - This Was Cool
MyHomeIsHere - My Home Is Here

我正在慢慢了解正则表达式，我相信要做到这一点，我应该使用preg_replace.我的问题是将表达式放在一起以找到匹配项.

Im slowly getting my head around regular expressions and I believe to do this I should use preg_replace. My problem is putting together the expression to find the match.

我只有这么远

   preg_replace('~^[A-Z]~', " ", $string)

每个字符串包含很多单词，但是只有第一个单词包含成串的单词，因此在我上面的示例中，字符串将是
"ThisWasCool再次拜访您"-这很酷再次拜访您"

Each string contains a lot of words, but ONLY the first word contains bunched words so using my example above a string would be
"ThisWasCool to visit you again" - "This Was Cool to visit you again"

我已经告诉它要从头开始，并寻找大写字母，但是我不知道该怎么做的是 -仅将其限制为每个字符串的第一个单词 -如何在空格后重复使用替换部分中的大写字母

I have told it to start at the beginning, and look for capitals, but what I dont know how to do is - restrict it only to the first word of each string - how to reuse the capital letter in the replace part after the space

推荐答案

问题

1. 您的正则表达式'~^[A-Z]~'将仅匹配第一个大写字母.在

1. Your regex '~^[A-Z]~' will match only the first capital letter. Check out Meta Characters in the Pattern Syntax for more information.

您的替换字符是换行符'\n'，而不是空格.

Your replacement is a newline character '\n' and not a space.

解决方案

使用此代码:

Solution

Use this code:

$String = 'ThisWasCool';
$Words = preg_replace('/(?<!\ )[A-Z]/', ' $0', $String);

(?<!\ )是断言确保我们没有在大写字母之前添加空格，而大写字母之前已经有空格.

The (?<!\ ) is an assertion that will make sure we don't add a space before a capital letter that already has a space before it.

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