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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: \s</h1> <p>How many white spaces are in the text "W3Schools has been live since 1999"?:</p> <?php $txt = "W3Schools has been live since 1999"; $pattern = "/\s/"; echo preg_match_all($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：\s
在文本 "W3Schools has been live since 1999" 中有多少个空格？
5
匹配项在此处找到
W3Schools#has#been#live#since#1999
（每次匹配都替换为“#”字符）
