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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: o{2,5}</h1> <p>How many occurences of at least 2 preceeding o's (oo), but not more than 5 preceeding o's (ooooo) are in the text "freew3c is goood"?:</p> <?php $txt = "freew3c is gooood"; $pattern = "/o{2,5}/"; echo preg_match_all($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{2,5}
在文本“freew3c is goood”中有多少个后跟至少 2 个 o（oo）但不超过 5 个 o（ooooo）的出现次数？
1
匹配项在此处找到
freew3c is g#d
（每次匹配都替换为“#”字符）