C#中的正则表达式大写替换
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Regular Expression Uppercase Replacement in C#
提问by Sprogz
I have the following C# which simply replaces parts of the input string that look like EQUIP:19d005 into URLs, like this:
我有以下 C#，它只是将输入字符串中看起来像 EQUIP:19d005 的部分替换为 URL，如下所示：
input = Regex.Replace(input, @"(EQUIP:)(\S+)", @"<a title=""View equipment item "" href=""/EquipmentDisplay.asp?eqnum=""></a>", RegexOptions.IgnoreCase);
The HTML ends up looking like this.
HTML 最终看起来像这样。
<a title="View equipment item 19d005" href="/EquipmentDisplay.asp?eqnum=19d005">EQUIP:19d005</a>
The only trouble is that the destination page expects the eqnum querystring to be all UPPERCASE so it returns the correct equipment when eqnum=19D005 but fails if it receives eqnum=19d005.
唯一的问题是目标页面期望 eqnum 查询字符串全部为大写，因此当 eqnum=19D005 时它返回正确的设备，但如果它收到 eqnum=19d005 则失败。
I guess I can modify and correct EquipmentDisplay.asp's errant requirement of uppercase values however, if possible I'd like to make the C# code comply with the existing classic ASP page by uppercasing the $2 in the Regex.Replace statement above.
我想我可以修改和更正 EquipmentDisplay.asp 对大写值的错误要求，但是，如果可能的话，我希望通过在上面的 Regex.Replace 语句中大写 $2 来使 C# 代码符合现有的经典 ASP 页面。
Ideally, I'd like the HTML returned to look like this:
理想情况下，我希望 HTML 返回如下所示：
<a title="View equipment item 19d005" href="/EquipmentDisplay.asp?eqnum=19D005">EQUIP:19d005</a>
Notice although the original string was EQUIP:19d005 (lowercase), only the eqnum= value is uppercased.
请注意，尽管原始字符串是 EQUIP:19d005（小写），但只有 eqnum= 值是大写的。
Can it be done and if so, what's the tidiest way to do it?
可以做到吗？如果可以，最整洁的方法是什么？
采纳答案by Duncan
OK, 2 solutions, one inline:
好的，2 个解决方案，一个内联：
input = Regex.Replace(input, @"(EQUIP:)(\S+)", m => string.Format(@"<a title=""View equipment item {1}"" href=""/EquipmentDisplay.asp?eqnum={2}"">{0}{1}</a>", m.Groups[1].Value, m.Groups[2].Value, m.Groups[2].Value.ToUpper()), RegexOptions.IgnoreCase);
The other using a separate function:
另一个使用单独的函数：
var input = Regex.Replace(input, @"(EQUIP:)(\S+)", Evaluator, RegexOptions.IgnoreCase);
private static string Evaluator(Match match)
{
return string.Format(@"<a title=""View equipment item {1}"" href=""/EquipmentDisplay.asp?eqnum={2}"">{0}{1}</a>", match.Groups[1].Value, match.Groups[2].Value, match.Groups[2].Value.ToUpper());
}
回答by John Fiala
Assuming that input is a string:
假设输入是一个字符串：
input = Regex.Replace(input.ToUpper, @"(EQUIP:)(\S+)", @"<a title=""View equipment item $2"" href=""/EquipmentDisplay.asp?eqnum=$2"">$1$2</a>", RegexOptions.IgnoreCase);
input = Regex.Replace(input.ToUpper, @"(EQUIP:)(\S+)", @"<a title=""View equipment item $2"" href=""/EquipmentDisplay.asp?eqnum=$2"">$1$2</a>", RegexOptions.IgnoreCase);
Changing the case of a string isn't something regex does.
改变字符串的大小写不是正则表达式所做的。
回答by JaredPar
Using Regex.Replace directly I do not think there is a way. But you could make this a two step process and get the result you are looking for.
直接使用 Regex.Replace 我认为没有办法。但是您可以将此过程分为两步并获得您正在寻找的结果。
var match = Regex.Match(input, @"(EQUIP:)(\S+)", RegexOptions.IgnoreCase);
var input = String.Format( @"<a title=""View equipment item {1}"" href=""/EquipmentDisplay.asp?eqnum={2}"">{0}{1}</a>",
match.Groups[1].Value,
match.Groups[2].Value,
match.Groups[2].Value.ToUpper());
回答by Vinko Vrsalovic
You can use a MatchEvaluator delegate instead of a string in the replacement. You can then embed the delegate as an anonymous function if on recent .NET. The 'old' solution might look like something like this:
您可以在替换中使用 MatchEvaluator 委托而不是字符串。如果在最近的 .NET 上，您可以将委托作为匿名函数嵌入。“旧”解决方案可能如下所示：
static void Main(string[] args)
{
string input = "EQUIP:12312dd23";
string output = Regex.Replace(input, @"(EQUIP:)(\S+)",
new MatchEvaluator(genURL), RegexOptions.IgnoreCase);
Console.WriteLine(output);
Console.ReadKey();
}
static string genURL(Match m)
{
return string.Format(@"<a title=""View item {0}""
href=""/EqDisp.asp?eq={2}"">{1}{0}</a>",
m.Groups[2].Value,m.Groups[1].Value,m.Groups[2].Value.ToUpper());
}
回答by Jesse C. Slicer
string input = "EQUIP:19d005";
Regex regex = new Regex (@"(EQUIP:)(\S+)", RegexOptions.IgnoreCase);
string eqlabel = regex.Replace(input, "");
string eqnum = regex.Replace(input, "");
string eqnumu = eqnum.ToUpperInvariant();
input = string.Format(@"<a title=""View equipment item {1}"" href=""/EquipmentDisplay.asp?eqnum={2}"">{0}{1}</a>", eqlabel, eqnum, eqnumu);
回答by Vivek
public static string FormatToCustomAnchorTag(this string value)
{
return Regex.Replace(value.ToLower() + value.ToUpper(),
@"(?<equiplo>equip:)(?<equipnolo>\S+)(?<equipup>EQUIP:)(?<equipnoup>\S+)",
@"<a title=""View equipment item ${equipnolo}"" href=""/EquipmentDisplay.asp?eqnum=${equipnoup}"">${equipup}${equipnolo}</a>");
}
