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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [^eo]</h1> <p>How many letters in the text "Welcome" are not "e" or "o":</p> <?php $txt = "Welcome"; $pattern = "/[^eo]/"; echo preg_match_all($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：[^eo]
在文本“Welcome”中有多少个字母既不是“e”也不是“o”？
4
匹配项在此处找到
#e##o#e
（每次匹配都替换为“#”字符）