php 判断字符串包含指定字符

下面是利用正则表达式来判断字符串包含指定字符的php代码，主要用到了ereg函数来征

<script>ec(2);</script>

//实例一

代码如下	复制代码
$string="i am abc";     if (ereg ("www.111cn.net", $string)) echo "'abc' is true ";                       if (ereg ("^abc", $string)) echo "'^abc' is true ";                       if (ereg ("abc$", $string)) echo "'abc$' is true";

//实例二

 

代码如下	复制代码
$string = "this is a test. that is another test.";      echo ereg_replace (" is", "  was", $string)." ";      echo ereg_replace (" is", " is", $string)." ";      echo ereg_replace ("test", "test", $string);