我怎样才能从一个字符串[]删除无字母字符? [英] How can i remove none alphabet chars from a string[]?
问题描述
这是代码:
StringBuilder sb = new StringBuilder();
Regex rgx = new Regex("[^a-zA-Z0-9 -]");
var words = Regex.Split(textBox1.Text, @"(?=(?<=[^\s])\s+\w)");
for (int i = 0; i < words.Length; i++)
{
words[i] = rgx.Replace(words[i], "");
}
在即时通讯做的 Regex.Split()
的话还包含字符串与字符里面〔实施例:
When im doing the Regex.Split()
the words contain also strings with chars inside for exmaple:
丹尼尔>
或
您好:
或
\r\\\
New
或
你好------------------- --------
和我需要得到只有一行字没有所有的迹象
And i need to get only the words without all the signs
所以我试图用这个循环,但我最终在的话有很多地方与,
和一些地方只 ------------------------
So i tried to use this loop but i end that in words there are many places with ""
And some places with only ------------------------
,我不能用这个字符串后面我的代码。
And i cant use this as strings later in my code.
推荐答案
您并不需要一个正则表达式来清除非字母。这将删除所有非Unicode字母。
You don't need a regex to clear non-letters. This will remove all non-unicode letters.
public string RemoveNonUnicodeLetters(string input)
{
StringBuilder sb = new StringBuilder();
foreach(char c in input)
{
if(Char.IsLetter(c))
sb.Append(c);
}
return sb.ToString();
}
另外,如果你只想让拉丁字母,你可以使用这个
Alternatively, if you only want to allow Latin letters, you can use this
public string RemoveNonLatinLetters(string input)
{
StringBuilder sb = new StringBuilder();
foreach(char c in input)
{
if(c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
sb.Append(c);
}
return sb.ToString();
}
基准VS正则表达式
public static string RemoveNonUnicodeLetters(string input)
{
StringBuilder sb = new StringBuilder();
foreach (char c in input)
{
if (Char.IsLetter(c))
sb.Append(c);
}
return sb.ToString();
}
static readonly Regex nonUnicodeRx = new Regex("\\P{L}");
public static string RemoveNonUnicodeLetters2(string input)
{
return nonUnicodeRx.Replace(input, "");
}
static void Main(string[] args)
{
Stopwatch sw = new Stopwatch();
StringBuilder sb = new StringBuilder();
//generate guids as input
for (int j = 0; j < 1000; j++)
{
sb.Append(Guid.NewGuid().ToString());
}
string input = sb.ToString();
sw.Start();
for (int i = 0; i < 1000; i++)
{
RemoveNonUnicodeLetters(input);
}
sw.Stop();
Console.WriteLine("SM: " + sw.ElapsedMilliseconds);
sw.Restart();
for (int i = 0; i < 1000; i++)
{
RemoveNonUnicodeLetters2(input);
}
sw.Stop();
Console.WriteLine("RX: " + sw.ElapsedMilliseconds);
}
输出(SM =字符串操作,RX =正则表达式)
Output (SM = String Manipulation, RX = Regex)
SM: 581
RX: 9882
SM: 545
RX: 9557
SM: 664
RX: 10196
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