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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [e-o]</h1> <p>How many letters in the text "Welcome" are alphabetically between "e" and "o":</p> <?php $txt = "Welcome"; $pattern = "/[e-o]/"; echo preg_match_all($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：[e-o]
在文本 "Welcome" 中，有多少个字母在字母表中位于 "e" 和 "o" 之间？
5
匹配项在此处找到
W##c###
（每次匹配都替换为“#”字符）