I want to remove all underscores from a string with the uppercase of the character following the underscore. So for example: _my_string_
becomes: MyString
similarly: my_string
becomes MyString
Is there a simpler way to do it? I currently have the following (assuming no input has two consecutive underscores):
StringBuilder sb = new StringBuilder();
int i;
for (i = 0; i < input.Length - 1; i++)
{
if (input[i] == '_')
sb.Append(char.ToUpper(input[++i]));
else if (i == 0)
sb.Append(char.ToUpper(input[i]));
else
sb.Append(input[i]);
}
if (i < input.Length && input[i] != '_')
sb.Append(input[i]);
return sb.ToString();
Now I know this is not totally related, but I thought to run some numbers on the implementations provided in the answers, and here are the results in Milliseconds for each implementation using 1000000 iterations
of the string: "_my_string_121_a_"
:
Achilles: 313
Raj: 870
Damian: 7916
Dmitry: 5380
Equalsk: 574
method utilised:
Stopwatch stp = new Stopwatch();
stp.Start();
for (int i = 0; i < 1000000; i++)
{
sb = Test("_my_string_121_a_");
}
stp.Stop();
long timeConsumed= stp.ElapsedMilliseconds;
In the end I think I'll go with Raj's implementation, because it's just very simple and easy to understand.
This must do it using ToTitleCase using System.Globalization
namespace
static string toCamel(string input)
{
TextInfo info = CultureInfo.CurrentCulture.TextInfo;
input= info.ToTitleCase(input).Replace("_", string.Empty);
return input;
}
Shorter ( regular expressions ), but I doubt if it's better (regular expressions are less readable):
string source = "_my_string_123__A_";
// MyString123A
string result = Regex
// _ + lower case Letter -> upper case letter (thanks to Wiktor Stribiżew)
.Replace(source, @"(_+|^)(\p{Ll})?", match => match.Groups[2].Value.ToUpper())
// all the other _ should be just removed
.Replace("_", "");
Loops over each character and converts to uppercase as necessary.
public string GetNewString(string input)
{
var convert = false;
var sb = new StringBuilder();
foreach (var c in input)
{
if (c == '_')
{
convert = true;
continue;
}
if (convert)
{
sb.Append(char.ToUpper(c));
convert = false;
continue;
}
sb.Append(c);
}
return sb.ToString().First().ToString().ToUpper() + sb.ToString().Substring(1);
}
Usage:
GetNewString("my_string");
GetNewString("___this_is_anewstring_");
GetNewString("___this_is_123new34tring_");
Output:
MyString
ThisIsAnewstring
ThisIs123new34tring
Try with Regex:
var regex = new Regex("^[a-z]|_[a-z]?");
var result = regex.Replace("my_string_1234", x => x.Value== "_" ? "" : x.Value.Last().ToString().ToUpper());
Tested with:
my_string -> MyString
_my_string -> MyString
_my_string_ -> MyString
static string toCamel(string input)
{
StringBuilder sb = new StringBuilder();
int i;
for (i = 0; i < input.Length; i++)
{
if ((i == 0) || (i > 0 && input[i - 1] == '_'))
sb.Append(char.ToUpper(input[i]));
else
sb.Append(char.ToLower(input[i]));
}
return sb.ToString();
}
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