php preg 比赛计数比赛
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preg match count matches
提问by Scarface
I have a preg match statement, and it checks for matches, but I was wondering how you can count the matches. Any advice appreciated.
我有一个 preg match 语句，它检查匹配，但我想知道如何计算匹配。任何建议表示赞赏。
$message='[tag] [tag]';
preg_match('/\[tag]\b/i',$message);
for example a count of this message string should lead to 2 matches
例如，此消息字符串的计数应导致 2 个匹配项
回答by Artefacto
$message='[tag] [tag]';
echo preg_match_all('/\[tag\](?>\s|$)/i', $message, $matches);
gives 2. Note you cannot use \bbecause the word boundary is before the ], not after.
给2. 请注意，您不能使用，\b因为单词边界在 之前]，而不是之后。
See preg_match_all.
回答by webbiedave
preg_matchalready returns the number of times the pattern matched.
preg_match已经返回模式匹配的次数。
However, this will only be 0 or 1 as it stops after the first match. You can use preg_match_allinstead as it will check the entire string and return the total number of matches.
但是，这只会是 0 或 1，因为它会在第一场比赛后停止。您可以改用preg_match_all ，因为它会检查整个字符串并返回匹配的总数。
回答by Matěj G.
You should use preg_match_allif you want to match all occurences. preg_match_allreturns number of matches. preg_matchreturns only 0 or 1, because it matches only once.
preg_match_all如果要匹配所有出现，则应使用。preg_match_all返回匹配数。preg_match只返回 0 或 1，因为它只匹配一次。
回答by Manos Dilaverakis
I think you need preg_match_all. It returns the number of matches it finds. preg_match stops after the first one.
我认为你需要preg_match_all。它返回它找到的匹配数。preg_match 在第一个之后停止。
回答by Danon
You could use T-Regx librarywith count()method (and even automatic delimiters):
您可以将T-Regx 库与count()方法（甚至自动分隔符）一起使用：
$count = pattern('\[tag]\b', 'i')->match('[tag] [tag]')->count();
$count // 2
