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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: i</h1> <p>How many occurences of the letter s is in the text "Freew3c":</p> <?php $txt = "Freew3c"; $pattern = "/e/i"; echo preg_match_all($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：i
文本“Freew3c”中有多少个字母“e”？
2
匹配项在此处找到
fr##w3c
（每次匹配都替换为“#”字符）