如何從字符串中查找（並替換）大寫字母的單詞？

Question

$string = "WORD is the first HEJOU is the Second BOOM is the Third"; 
$sring = str_replce('???', '???<br>', $string); 
echo $string; // <br>WORD is the first <br>HEJOU is the Second <br>BOOM is the Third 

那麼這個例子說明了一切。我想選擇大寫字母的所有單詞（而不是以大寫字母開頭的單詞）並替換爲前面的內容。有任何想法嗎？

Answer 1

$string = "WORD is the first HEJOU is the Second BOOM is the Third"; 
$string = preg_replace("#\b([A-Z]+)\b#", "<br>\\1", $string); 
echo $string; 

OUTOUT
<br>WORD is the first <br>HEJOU is the Second <br>BOOM is the Third

正則表達式表示：

\b - Match a word boundary, zero width 
[A-Z]+ - Match any combination of capital letters 
\b - Match another word boundary 
([A-Z]+) - Capture the word for use in the replacement 

然後，在更換

\\1, replace with the captured group. 

Answer 2

使用正則表達式

http://php.net/manual/en/function.preg-replace.php

Answer 3

str_replace只需更換特定字符串的其他特定之一。您可以使用正在使用preg_replace

print preg_replace('~\b[A-Z]+\b~','<br>\\0',$string);