Php 在字符串中的大写字母前放置一个空格（正则表达式）
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Php put a space in front of capitals in a string (Regex)
提问by Paul M
I have a number of strings which contain words which are bunched together and I need to seperate them up.
我有许多字符串，其中包含聚集在一起的单词，我需要将它们分开。
For example
ThisWasCool - This Was Cool
MyHomeIsHere - My Home Is Here
例如 ThisWasCool - 这很酷
MyHomeIsHere - 我的家在这里
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.
我慢慢地了解正则表达式，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。
I have only got this far
我只有这一步
preg_replace('~^[A-Z]~', " ", $string)
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"
每个字符串包含很多单词，但只有第一个单词包含成束的单词，因此使用我上面的示例，字符串将是
“ThisWasCool to visit you again” - “This Was Cool to visit you again”
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
我已经告诉它从头开始，并寻找大写字母，但我不知道该怎么做 - 将其限制为每个字符串的第一个单词 - 如何在空格后的替换部分重用大写字母
回答by matpie
Problem
问题
Your regex
'~^[A-Z]~'will match only the first capital letter. Check out Meta Charactersin the Pattern Syntaxfor more information.Your replacement is a newline character
'\n'and not a space.
Solution
解决方案
Use this code:
使用此代码：
$String = 'ThisWasCool';
$Words = preg_replace('/(?<!\ )[A-Z]/', ' $string = preg_replace('/[A-Z]/', ' $string = ltrim(preg_replace('/[A-Z]/', ' $str = "CheckOutMyBMW I bought it yesterday";
$parts = explode(' ', $str);
$parts[0] = preg_replace('~([a-z])([A-Z])~', '\1 \2', $parts[0]);
$newstr = implode(' ', $parts);
echo $newstr;
', $string));
', $string);
', $String);
The (?<!\ )is an assertionthat will make sure we don't add a space before a capital letter that already has a space before it.
这(?<!\ )是一个断言，它将确保我们不会在已经有空格的大写字母之前添加空格。
回答by Alex Barrett
$string="ThisWasCool to visit you again";
$temp = explode(' ',$string, 2);
$temp[0] = preg_replace('/(.)([A-Z])/',' ', $temp[0]);
$string = join(' ',$temp);
Maybe run the result through ltrimafter.
也许之后通过ltrim运行结果。
$string="ThisWasCool to visit you again";
$temp = explode(' ',$string, 2);
$temp[0] = preg_replace('/(?<!^)([A-Z])/',' ##代码##', $temp[0]);
$string = join(' ',$temp);
回答by too much php
Here's my .02c, this version will only act on the first word, and will preserve sequences of uppercase letters (BMW).
这是我的 .02c，这个版本只会作用于第一个单词，并且会保留大写字母序列 (BMW)。
##代码##回答by Eineki
I'm not proficient with regular expression but I would suggest something like the following code:
我不精通正则表达式，但我建议使用以下代码：
##代码##Looking at SirLancelot code I've got a second solution. Still I prefer the explode solution as you stated that your target it is only the first word of the string.
查看 SirLancelot 代码我有第二个解决方案。我仍然更喜欢爆炸解决方案，因为您说您的目标只是字符串的第一个单词。
##代码##