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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [0-5]</h1> <p>How many characters in the text "Call 555-2368" is a digit between "0" and "5":</p> <?php $txt = "Call 555-2368"; $pattern = "/[0-5]/"; echo preg_match_all($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：[0-5]
在文本“Call 555-2368”中有多少个字符是介于“0”和“5”之间的数字？
5
匹配项在此处找到
Call ###-##68
（每次匹配都替换为“#”字符）