我正在创建一个在文本字符串中搜索关键字的方法。例如:假设我想找到单词“Happy”,以及它在一本书中出现了多少次。然后,我希望在单词前后显示100个字符,并对找到的每个单词“Happy”执行此操作。
我能够找到一次代码来做这件事,但是我如何才能对所有关键字的出现都这样做,在本例中是单词“Happy”?
下面是查找一个匹配项并显示前后字符的工作代码。
$text= $Content;
$find = 'Happy';
$result = strpos($text, $find);
echo substr($text,($result-100>0)?($result-100):0,100)." ".$find." "
.substr($text,$result+strlen($find),100);
如何在循环中执行此操作并找到某个关键字的所有匹配项?
发布于 2018-07-08 03:07:40
根据this的说法
这可能会帮助你找到第二个
$pos1 = strpos($haystack, $needle);
$pos2 = strpos($haystack, $needle, $pos1 + strlen($needle));
第三个参数是您搜索单词的偏移量。因此,默认值为0。并且+strlen($needle)
将候选词长添加到最后出现的位置,该位置是$needle
的起点。
然后以递归方式或其他方式这样做
发布于 2018-07-08 06:08:22
下面不区分大小写,也适用于重音字符:
$out = [];
$find = 'Happy';
$charsBA = 100; // number of characters before / after
$offset = 0;
while(false !== ($pos = mb_stripos($text, $find, $offset, 'utf-8'))){
$out[] = mb_substr($text, max(0, $pos-$charsBA), $charsBA*2+mb_strlen($find, 'utf-8'), 'utf-8');
$offset = ++$pos;
}
print_r($out); // display found occurences
发布于 2018-07-08 06:28:59
也许这就是你需要的?
$key="sed";
$string = "/([\s\S]{0,100})$key([\s\S]{0,100})/i";
$matches=null;
$paragraph = "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?";
if (preg_match_all($string, $paragraph, $matches)) {
echo count($matches[0]) . " matches found";
}else {
echo "match NOT found";
}
var_dump($matches[0]);
https://stackoverflow.com/questions/51226113
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