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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: o{3}</h1> <p>How many occurences of 3 preceeding o's (ooo) are in the text "W3Schools is goood"?:</p> <?php $txt = "W3Schools is goood"; $pattern = "/o{3}/"; echo preg_match_all($pattern, $txt); ?> <p>The matches were found here:</p> <?php echo preg_replace($pattern, "#", $txt); ?> <p>(Each match was replaced by a # character)</p> </body> </html>
正则表达式修饰符：o{3}
在文本“W3Schools is goood”中有多少个前导 o（ooo）的 3 次出现？
1
匹配项在此处找到
W3Schools is g#d
（每次匹配都替换为“#”字符）
