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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 "W3Schools has been live since 1999.":</p> <?php $txt = "W3Schools 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: .
文本 "W3Schools has been live since 1999." 中有多少个任何字符或数字的出现?
35
匹配结果在这里
###################################
(每个匹配项都替换为 # 字符)