如何使用正则表达式将精确的短语替换为字符串

Question

我有以下字符串。

*keyName:品牌SLES重新定位：（不可重新定位）*keyOpenEnd

我想用{"重新封装*key，用"重新封装*keyOpenEnd：所以我有一个的结果字符串

｛"名称：品牌SLES重新定位：（不可重新定位）"：

所以我有

output = Regex.Replace(output, @"b"+"key"+@"b", "{"");
output = Regex.Replace(output, @"b*keyOpenEndb", "":");

我尝试过各种不同的组合，但都不起作用。

更新：这个问题似乎有点混乱。澄清；我需要替换确切的短语，否则它将替换KeyOpenEnd中的"Key"以及不好的Key。我需要精确的短语替换。

Answer 1

为什么不直接使用string.Replace并确保首先替换更具体的值

output = output.Replace("*keyOpenEnd", "":").Replace("*key", "{"");

编辑

下面是比较正则表达式时间与string.Replace和我的结果的测试代码

string s = "*keyName:branding-SLES Relocations:(not relocatable)*keyOpenEnd";
string desired = "{"Name:branding-SLES Relocations:(not relocatable)":";
Stopwatch watch = new Stopwatch();
watch.Start();
for (int i = 0; i < 100000; i++)
{
    var n = Regex.Replace(s, @"*keyOpenEnd", "":");
    n = Regex.Replace(n, @"*key", "{"");
    Assert.AreEqual(desired, n);
}
watch.Stop();
Console.WriteLine("RegEx Total: {0}", watch.Elapsed);
watch.Reset();
watch.Start();
for (int i = 0; i < 100000; i++)
{
    var n = s.Replace("*keyOpenEnd", "":").Replace("*key", "{"");
    Assert.AreEqual(desired, n);
}
watch.Stop();
Console.WriteLine("String Replace Total: {0}", watch.Elapsed);

结果：

RegEx Total: 00:00:00.1742555
String Replace Total: 00:00:00.0385957

附加编辑

如果您使用一个正则表达式并提前编译它以供使用，string.Replace仍然是更快的

string s = "*keyName:branding-SLES Relocations:(not relocatable)*keyOpenEnd";
string desired = "{"Name:branding-SLES Relocations:(not relocatable)":";
Regex r = new Regex(@"*key(.*)*keyOpenEnd", RegexOptions.Compiled);
Stopwatch watch = new Stopwatch();
watch.Start();
for (int i = 0; i < 100000; i++)
{
    var n = r.Replace(s, "{"$1":");
    Assert.AreEqual(desired, n);
}
watch.Stop();
Console.WriteLine("RegEx Total: {0}", watch.Elapsed);
watch.Reset();
watch.Start();
for (int i = 0; i < 100000; i++)
{
    var n = s.Replace("*keyOpenEnd", "":").Replace("*key", "{"");
    Assert.AreEqual(desired, n);
}
watch.Stop();
Console.WriteLine("String Replace Total: {0}", watch.Elapsed);

结果：

RegEx Total: 00:00:00.0960996
String Replace Total: 00:00:00.0393491

Answer 2

尝试将^*key替换为{，将*keyOpenEnd$替换为}

已编辑，如果*是通配符，则执行以下

用{"$1" 替换key(.*)keyOpenEnd