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PHP正则反向摘引求解

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Release: 2016-06-13 11:28:58
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PHP正则反向引用求解?
使用php反向捕获又不知道怎么回事了。

把下面字符串里面的4个连续的数外面的符号去掉。

fsdfsdafasfasdfsdf2365}>

,还请分析下我写的哪里有问题?

<?php<br />header("Content-type:text/html;charset=utf-8");<br />$str="fsdfsdafasfasdfsdf<{2365}>";<br />$mypreg="/<{(\d\d\d\d)}>/";//()里面表示4个连续的数,使用括号表示我捕获这个子表达式,一会引用<br />$mycon="\1"; //这个是替换内容,我反向引用上面的4个数字2365,用这4个数字替换上面有外符号的整块<{2365}><br />echo $str;<br />echo "<br/>";<br />$str=preg_replace($mypreg,$mycon,$str);<br />echo $str;<br />
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结果是能够捕获到 这个东东,但是反向引用怎么都没有内容,应该是反向引用错了,没有引用到内容。求指点。

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