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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: [123]</h1> <p>How many characters in the text "Freew3c has been live since 1999" is either the number "1", "2", or "3":</p> <?php $txt = "Freew3c has been live since 1999"; $pattern = "/[123]/"; echo preg_match_all($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：[123]
文本“Freew3c has been live since 1999”中有多少个字符是数字“1”、“2”或“3”？
2
匹配项在此处找到
Freew#c has been live since #999
（每次匹配都替换为“#”字符）