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<!DOCTYPE html> <html> <body> <h1>Regex Modifier: cat|dog|fish</h1> <p>How many occurrences of either "cat", "dog", or "fish" are in the text "We have three dogs, one fish, but no cats":</p> <?php $txt = "We have three dogs, one fish, but no cats"; $pattern = "/cat|dog|fish/"; echo preg_match_all($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：cat|dog|fish
文本“We have three dogs, one fish, but no cats”中有多少个“cat”、“dog”或“fish”的出现次数？
3
匹配项在此处找到
我们有三只#，一只#，没有#
（每次匹配都替换为“#”字符）