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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [re]</h1> <p>How many occurences of the letters "r" or "e" are in the text "freew3c.com":</p> <?php $txt = "freew3c.com"; $pattern = "/[re]/"; echo preg_match_all($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：[re]
在文本“freew3c.com”中有多少个字母“r”或“e”的出现次数？
3
匹配项在此处找到
f###w3c
（每次匹配都替换为“#”字符）