How to match image address and img tag with regular expression
这次给大家带来正则表达式怎么匹配图片地址与img标签的，正则表达式匹配图片地址与img标签的注意事项有哪些，下面就是实战案例，一起来看一下。
再上传表情或者图片地址时候很多时候不能直接上传<img src=" " />，因此在上传评论或者图片之前应该先处理一下img标签。举例如下，希望可以帮助更多的程序猿~
<span style="font-size:14px;">//第一步是获取到带有img标签的字符串 var str = '图片1<img src="arclist/sanai.png">图片2<img src="arclist/em_23.gif">图片3<img src="arclist/451.gif">';</span>
处理获取到的字符串
<span style="font-size:14px;">//将img标签替换为特定编码方式的表达式 var reg = /<img[^>]*src[=\"\'\s]+[^\.]*\/([^\.]+)\.[^\"\']+[\"\']?[^>]*>/gi; str = str.replace(reg, "[face:$1.gif]"); console.log(str);</span>
运算结果为：
<span style="font-size:14px;">图片1[face:sanai.gif]图片2[face:em_23.gif]图片3[face:451.gif]</span>
这样上传到服务器的代码就不会存在html标签，这是一种很好的应对带有图片评论且上传信息禁止html标签的方法。
接下来：
从服务器上返回的上一步中的运行结果，在反向解析，方法如下：
<span style="font-size:14px;">//将特定编码方式替换成img标签的表达式 var regg = / face:([\w]+).gif /gi; str = str.replace(regg,"<img src='images/$1.gif' />"); console.log(str);</span>
运行结果为：
<span style="font-size:14px;">图片1<img src='images/sanai.gif' />图片2<img src='images/em_23.gif' />图片3<img src='images/451.gif' /></span>
下面附上代码的html页，可以全部复制粘贴到html文件中直接运行，亲测可用
<span style="font-size:14px;"><!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <script> var str = '图片1<img src="arclist/sanai.png">图片2<img src="arclist/em_23.gif">图片3<img src="arclist/451.gif">'; //将img标签替换为特定编码方式的表达式 var reg = /<img[^>]*src[=\"\'\s]+[^\.]*\/([^\.]+)\.[^\"\']+[\"\']?[^>]*>/gi; str = str.replace(reg, "[face:$1.gif]"); console.log(str); //将特定编码方式替换成img标签的表达式 var regg = / face:([\w]+).gif /gi; str = str.replace(regg,"<img src='images/$1.gif' />"); console.log(str); </script> </body> </html></span>
相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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