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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: ^W3</h1> <p>Does the text "W3Schools", start with "W3"?:</p> <?php $txt = "W3Schools"; $pattern = "/^W3/"; echo preg_match_all($pattern, $txt); ?> <p>This method returns 1 if there is a match, otherwise 0.</p> <p>The matches were found here:</p> <?php echo preg_replace($pattern, "#", $txt); ?> <p>(The match was replaced by a # character)</p> </body> </html>
正则表达式修饰符：^W3
文本“W3Schools”是否以“W3”开头？
1
如果匹配成功，此方法返回 1，否则返回 0。
匹配项在此处找到
#Schools
（匹配项已被 # 字符替换）
