正则表达式格式 - 中国WEB开发者网络 (http://www.webasp.net) -- 技术教程 (http://www.webasp.net/article/) --- 正则表达式格式 (http://www.webasp.net/article/14/13843.htm) |
| -- 作者:未知 -- 发布日期: 2004-10-13 |
| 正则表达式在PHP中被用来处理复杂的文字串。支持正则表达式的函数有:
ereg() ereg replace() eregi replace() split() 这些函数都将正则表达式作为他们的第一个参数。PHP使用POSIX扩展规则表达式(使用POSIX 1003.2)。要找到所有的关于POSIX扩展规则表达式的描述,请查看包括在PHP发行版本之内的regex man页面。 Example 2-4. Regular expression examples ereg("abc",$string); /* Returns true if "abc" is found anywhere in $string. */ ereg("^abc",$string); /* Returns true if "abc" is found at the beginning of $string. */ ereg("abc$",$string); /* Returns true if "abc" is found at the end of $string. */ eregi("(ozilla.[23]|MSIE.3)",$HTTP_USER_AGENT); /* Returns true if client browser is Netscape 2, 3 or MSIE 3. */ ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+ )", $string,$regs); /* Places three space separated words into $regs[1], $regs[2] and $regs[3]. */ ereg_replace("^","<BR>",$string); /* Put a <BR> tag at the beginning of $string. */ ereg_replace("$","<BR>",$string); /* Put a <BR> tag at the end of $string. */ ereg_replace("\n","",$string); /* Get rid of any carriage return characters in $string. */ |
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