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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: \b</h1> <p>Does the text "Hello World" start with "Hel"?:</p> <?php $txt = "Hello World"; $pattern = "/\bHel/"; echo preg_match_all($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：\b
文本“Hello World”是否以“Hel”开头？
1
匹配项在此处找到
#lo World
（每次匹配都替换为“#”字符）
