检查字符串中的特殊字符(/*-+_@&$#%)?

How do I check a string to make sure it contains numbers, letters, or space only?

如何检查字符串以确保它只包含数字、字母或空格?

7 个解决方案

#1

The easiest way it to use a regular expression:

使用正则表达式最简单的方法是:

Regular Expression for alphanumeric and underscores

字母数字和下划线的正则表达式

Using regular expressions in .net:

在。net中使用正则表达式:

http://www.regular-expressions.info/dotnet.html

MSDN Regular Expression

MSDN正则表达式

Regex.IsMatch

var regexItem = new Regex("^[a-zA-Z0-9 ]*$");

if(regexItem.IsMatch(YOUR_STRING)){..}

#2

Simple:

简单:

function HasSpecialChars(string yourString)
{
    return yourString.Any( ch => ! Char.IsLetterOrDigit( ch ) )
}

#3

string s = @"$KUH% I*$)OFNlkfn$";
var withoutSpecial = new string(s.Where(c => Char.IsLetterOrDigit(c) 
                                            || Char.IsWhiteSpace(c)).ToArray());

if (s != withoutSpecial)
{
    Console.WriteLine("String contains special chars");
}

#4

Try this way.

尝试这种方式。

public static bool hasSpecialChar(string input)
    {
        string specialChar = @"\|!#$%&/()=?»«@£§€{}.-;'<>_,";
        foreach (var item in specialChar)
        {
            if (input.Contains(item)) return true;
        }

        return false;
    }

#5

String test_string = "tesintg#$234524@#";
if (System.Text.RegularExpressions.Regex.IsMatch(test_string, "^[a-zA-Z0-9\x20]+$"))
{
  // Good-to-go
}

An example can be found here: http://ideone.com/B1HxA

可以在这里找到一个示例:http://ideone.com/B1HxA

#6

If the list of acceptable characters is pretty small, you can use a regular expression like this:

如果可以接受的字符列表很小，可以使用这样的正则表达式:

Regex.IsMatch(items, "[a-z0-9 ]+", RegexOptions.IgnoreCase);

The regular expression used here looks for any character from a-z and 0-9 including a space (what's inside the square brackets []), that there is one or more of these characters (the + sign--you can use a * for 0 or more). The final option tells the regex parser to ignore case.

这里使用的正则表达式查找来自a-z和0-9的任何字符，包括空格(方括号内的内容[])，这些字符中有一个或多个(+符号——可以使用*表示0或更多)。最后一个选项告诉regex解析器忽略大小写。

This will fail on anything that is not a letter, number, or space. To add more characters to the blessed list, add it inside the square brackets.

这将在任何不是字母、数字或空间的东西上失败。要向受祝福的列表添加更多字符，请将其添加到方括号内。

#7

Use the regular Expression below in to validate a string to make sure it contains numbers, letters, or space only:

使用下面的正则表达式验证字符串，以确保它只包含数字、字母或空格:

[a-zA-Z0-9 ]

#1