求一个正则,不区分大小写以开头匹配5个字符串

[limeng_java]

问个正则问题``
怎么能让一个字符串跟这5个字符串左边匹配,不区分大小写
"a1/b2/c3/D4/e5"
就是以a1 b2 c3 d45 e5开头的都可以认为是匹配上了
比如
a1 true
b1 false
b234 true
3c false
d456 true
D456 true
d444 false


Regex regex = new Regex(@"^[a1|b2|c3|D4|e5].*$");
Match match = regex.Match(deviceType);
if (match.Success)
{
success = true;
}

可以直接在这个代码上改```

[EnForGrass]

Regex regex = new Regex(@"^((a1)|(b2)|(c3)|(D4)|(e5))*$");
Match match = regex.Match(deviceType);
if (match.Success)
{
success = true;
}

[人生难得一只鸡]

string pattern = @"(?i)^(a1|b2|c3|D4|e5).*?$";

[EnForGrass]

Regex regex = new Regex(@"^((a1)|(b2)|(c3)|(D4)|(e5)).*$");
Match match = regex.Match(deviceType);
if (match.Success)
{
success = true;
}
少写了个点

[porschev]

Regex re = new Regex("^((a1)|(b2)|(c3)|(D4)|(e5)).*$", RegexOptions.IgnoreCase);

if(re.IsMatch("你的字符串"))
{
  //符合
}
else
{
  不符合
}

[EnForGrass]

Regex regex = new Regex(@"(?i)^((a1)|(b2)|(c3)|(D4)|(e5)).*$");
Match match = regex.Match(deviceType);
if (match.Success)
{
  success = true;
}

[_浅浅]

("^/a|^/b|^/c|^/d|^/e|^")

[limeng_java]

经过试验,2楼的可以,谢谢大家``等下忙完结贴