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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [co]</h1> <p>How many occurences of the letters "c" or "o" are in the text "W3Schools.com":</p> <?php $txt = "W3Schools.com"; $pattern = "/[co]/"; echo preg_match_all($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：[co]
在文本“W3Schools.com”中有多少个字母“c”或“o”的出现次数？
5
匹配项在此处找到
W3S#h##ls.##m
（每次匹配都替换为“#”字符）
