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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [W-e]</h1> <p>How many letters in the text "Welcome to freew3c" are alphabetically between uppercase "W" and lowercase "e":</p> <?php $txt = "Welcome to freew3c"; $pattern = "/[W-e]/"; echo preg_match_all($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：[W-e]
在文本“Welcome to Freew3c”中，有多少个字母在字母表上介于大写“W”和小写“e”之间？
7
匹配项在此处找到
##l#om# to fr##w3#
（每次匹配都替换为“#”字符）