php 多个单词的 preg_match
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preg_match for multiple words
提问by Asim Zaidi
I want to test a string to see it contains certain words.
我想测试一个字符串以查看它包含某些单词。
i.e:
IE：
$string = "The rain in spain is certain as the dry on the plain is over and it is not clear";
preg_match('`\brain\b`',$string);
But that method only matches one word. How do I check for multiple words?
但是这种方法只匹配一个词。如何检查多个单词？
回答by jeroen
Something like:
就像是：
preg_match_all('#\b(rain|dry|clear)\b#', $string, $matches);
回答by Czechnology
preg_match('~\b(rain|dry|certain|clear)\b~i',$string);
You can use the pipe character (|) as an "or" in a regex.
您可以将管道字符 ( |) 用作正则表达式中的“或”。
If you just need to know if any of the words is present, use preg_matchas above. If you need to match all the occurences of any of the words, use preg_match_all:
如果您只需要知道是否存在任何单词，请使用preg_match如上。如果您需要匹配任何单词的所有出现，请使用preg_match_all：
preg_match_all('~\b(rain|dry|certain|clear)\b~i', $string, $matches);
Then check the $matchesvariable.
然后检查$matches变量。
回答by Pave
http://php.net/manual/en/function.preg-match.php
http://php.net/manual/en/function.preg-match.php
"Do not use preg_match() if you only want to check if one string is contained in another string. Use strpos() or strstr() instead as they will be faster."
“如果您只想检查一个字符串是否包含在另一个字符串中，请不要使用 preg_match()。改用 strpos() 或 strstr()，因为它们会更快。”
回答by cetver
preg_match('\brain\b',$string, $matches);
var_dump($matches);
