将PHP的eregi更改为preg_match

Question

我不知道如何解决这个错误

 Warning: preg_match(): Unknown modifier '[' in 

我的代码是

while(list($k,$v)=each($con2)) {
    $patt="($this->block_start_word|$this->block_end_word)[[:blank:]]*([0-9a-zA-Z\_]+)[[:blank:]]*$this->block_end_delim(.*)";
    if (eregi($patt,$v,$res)) {

我想将eregi的php版本更新为preg_match，我对此进行了解释

while(list($k,$v)=each($con2)) {
    $patt="($this->block_start_word|$this->block_end_word)[[:blank:]]*([0-9a-zA-Z\_]+)[[:blank:]]*$this->block_end_delim(.*)";
    if ( preg_match($patt,$v,$res)) {

Answer 1

如您在此答案中所见，preg_match将第一个字符视为定界符如何将PHP的eregi更改为preg_match

具体来说，您会收到错误消息，因为preg_match使用'（'作为分隔符，因此在（$ this-> block_start_word | $ this-> block_end_word）和'['

将模式更改为$ patt =“ /（$ this-> block_start_word | $ this-> block_end_word）[[：blank：]] （[0-9a-zA-Z _] +）[[：blank：]] $ this - > block_end_delim（。*）/“;

它应该起作用，Goodluck！

Answer 2

好，让我们来看一下这个正则表达式：

"($this->block_start_word|$this->block_end_word)[[:blank:]]*([0-9a-zA-Z\\_]+)[[:blank:]]*$this->block_end_delim(.*)"

我想你要：

• 文字字符串$this->block_start_word或$this->block_end_word
• 后跟0个或多个空格字符
• 后跟1个或多个字母数字字符
• 后跟0个或多个空格
• 后跟文字字符串$this->block_end_delim
• 直到行尾

记住，怎么样

<?php
$handle = fopen('php://stdin', "r");
while (($line = fgets($handle, 4096)) !== false) {
        $exp  = '/';
        $exp .= '(';
        $exp .= '\$this\-\>block_start_word';
        $exp .= '|';
        $exp .= '\$this\-\>block_end_word';
        $exp .= ')';
        $exp .= '\s*'; // Like [[:blank:]]*
        $exp .= '([0-9a-zA-Z\_]+)';
        $exp .= '\s*'; // Like [[:blank:]]*
        $exp .= '\$this\-\>block_end_delim';
        $exp .= '(.*)/';
        if(preg_match($exp,$line)) {
                print $line;
        }
}
?>

如果$this->block_start_word ， $this->block_end_word和$this->block_end_delim在PHP脚本的其他位置设置：

<?php
$handle = fopen('php://stdin', "r");
while (($line = fgets($handle, 4096)) !== false) {
        $exp  = '/';
        $exp .= '(';
        $exp .= '$this->block_start_word;
        $exp .= '|';
        $exp .= '$this->block_end_word;
        $exp .= ')';
        $exp .= '\s*'; // Like [[:blank:]]*
        $exp .= '([0-9a-zA-Z\_]+)';
        $exp .= '\s*'; // Like [[:blank:]]*
        $exp .= $this->block_end_delim;
        $exp .= '(.*)/';
        if(preg_match($exp,$line)) {
                print $line;
        }
}
?>

Answer 3

使用preg_match您应该定义定界符，并且最好同时包含preg_quote ：

$patt="/(".preg_quote($this->block_start_word)."|".preg_quote($this->block_end_word."))[[:blank:]]*([0-9a-zA-Z\_]+)[[:blank:]]*".preg_quote($this->block_end_delim)."(.*)/";