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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: .</h1> <p>How many occurrences of ANY character or digit are in the text "freew3c has been live since 1999.":</p> <?php $txt = "freew3c has been live since 1999."; $pattern = "/./"; echo preg_match_all($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：.
在文本“freew3c has been live since 1999.”中有多少个任意字符或数字的出现次数？
33
匹配项在此处找到
#################################
（每次匹配都替换为“#”字符）