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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [A-Z]</h1> <p>How many letters in the text "Welcome to W3Schools" are alphabetically between uppercase "A" and uppercase "Z":</p> <?php $txt = "Welcome to W3Schools"; $pattern = "/[A-Z]/"; echo preg_match_all($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：[A-Z]
在文本“Welcome to W3Schools”中有多少个字母按字母顺序排在（不含）大写字母“A”和（不含）大写字母“Z”之间？
3
匹配项在此处找到
#elcome to #3#chools
（每次匹配都替换为“#”字符）
