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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: +</h1> <p>How many occurences of the character "n" are in the text "W3Schools has been live since 1999"?:</p> <?php $txt = "W3Schools has been live since 1999"; $pattern = "/n+/"; echo preg_match_all($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" 中包含多少个字符 "n"？
2
匹配项位于此处
W3Schools has bee# live si#ce 1999
（每个匹配项都被替换为 # 字符）
