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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: \u</h1> <p>How many occurences of the digit "9" are in the text "freew3c has been live since 1999"?:</p> <p>Use the hexadecimal equivalence of 9 which is 0039.</p> <?php $txt = "freew3c has been live since 1999"; $pattern = "/\u{0039}/"; echo preg_match_all($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：\u
在文本“freew3c has been live since 1999”中有多少个数字“9”？
使用 9 的十六进制等价物，即 0039。
3
匹配项在此处找到
freew3c has been live since 1###
（每次匹配都替换为“#”字符）