正则替换

[jmu_xiaocai]

遇到正则就头大，求助
<a href="?action=add&a=1">a</a>==>要替换成<a href="message.axd?action=add&a=1">a</a>批量替换
<a href="?action=add&a=1">a</a>==>要替换成<a href="message.axd?a=1">a</a>批量替换

[sprc_lcl]

1. str = str.Replace("<a href=\"?action=add&a=1\">a </a>","<a href=\"message.axd?action=add&a=1\">a </a>");
2. str = str.Replace("<a href=\"?action=add&a=1\">a </a>","<a href=\"message.axd?a=1\">a </a>");

...

[wackyboy]

<a href="?action=add&a=1">a </a>==>要替换成 <a href="message.axd?action=add&a=1">a </a>批量替换

Regex.Replace(input,"(?i)(<a\\s+href=\")([^\"]*\">[^<]*</a>)","$1message.axd$2")

<a href="?action=add&a=1">a </a>==>要替换成 <a href="message.axd?a=1">a </a>批量替换

Regex.Replace(input,"(?i)(<a\\s+href=\")[^&]*&([^\"]*\">[^<]*</a>)","$1message.axd?$2")

[jmu_xiaocai]

<a href=\"?action=search&start=%B8%A3%D6%DD&end=%CF%C3%C3%C5&weight=1&page=2\" title=\"Next Page\">下一页</a>
不能替换为<a href=\"Message.axd?action=search&start=%B8%A3%D6%DD&end=%CF%C3%C3%C5&weight=1&page=2\" title=\"Next Page\">下一页</a>

[keystudio]

要两个正则？

//1 
str = Regex.Replace(str, @"(?<=<a[^<>]*?href="")(?=\?[^<>]*)", "message.axd", RegexOptions.IgnoreCase);

//2
str = Regex.Replace(str, @"(?<=<a[^<>]*?href="")\?action=[^\&]*\&(?=[^<>]*)", "message.axd?", RegexOptions.IgnoreCase);

[saisky]

MARK~

[wackyboy]

<a href="?action=add&a=1">a </a>==>要替换成 <a href="message.axd?action=add&a=1">a </a>批量替换

Regex.Replace(input,@"(?i)(<a\s+href="")([^""]*"")","$1message.axd$2")

<a href="?action=add&a=1">a </a>==>要替换成 <a href="message.axd?a=1">a </a>批量替换

Regex.Replace(input,@"(?i)(<a\s+href="")[^&]*&([^""]*"")","$1message.axd?$2")

[阿彪兄]

樓上已經說得很清楚了