[英]Format A String
Well, 好,
I just can't format the following string: 我只是无法格式化以下字符串:
string oldFormat = "949123U0456789";
oldFormat = string.Format(@"{0: ###.###-##-###.###}",oldFormat);
the result should be: 949.123-U0-456.789 结果应该是:949.123-U0-456.789
Does anyone have a better way to format this string? 有谁有更好的方式格式化此字符串?
You can use Insert
: 您可以使用Insert
:
"949123U0456789".Insert(11, ".").Insert(8, "-").Insert(6, "-").Insert(3, ".")
Note that I am inserting from the end, to avoid the addition of the inserted string from affecting the index. 请注意,我从头开始插入,以避免插入的字符串的添加影响索引。
The format string you have used is meant for numeric types - a string is not a numeric types (and when passing in a string to string.Format
, it will simply be returned, as it already is a string). 您使用的格式字符串适用于数字类型-字符串不是数字类型(并且在将字符串传递给string.Format
,由于它已经是字符串,因此将简单地返回)。
There are other approaches, as can be seen in Format string with dashes : 还有其他方法,如带破折号的格式字符串中所示 :
Using regex: 使用正则表达式:
Regex.Replace("949123U0456789",
@"^(.{3})(.{3})(.{2})(.{3})(.{3})$",
"$1.$2-$3-$4.$5");
Or with Substring. 或带子串。
Regex can solve the problem of formatting when there is a mix of letters and numbers. 当字母和数字混合在一起时,正则表达式可以解决格式问题。
using System.Text.RegularExpressions;
string pattern = @"([a-z0-9A-Z]{3})([a-z0-9A-Z]{3})
([a-z0-9A-Z]{2})([a-z0-9A-Z]{3})([a-z0-9A-Z]{3})"
string oldFormat = "949123U0456789";
string newFormat = Regex.Replace(oldFormat, pattern,
"$1.$2-$3-$4.$5");
I love regular expressions :D, they have the added benefit of allowing you to check the syntax of the code, if it has to follow a certain convention (ie perform validation). 我喜欢正则表达式:D,如果必须遵守某种约定(即执行验证),它们还有其他好处,即允许您检查代码的语法。
In order to perform validation, you can use: 为了执行验证,您可以使用:
Regex.IsMatch(oldFormat,
@"([a-z0-9A-Z]{3})([a-z0-9A-Z]{3})
([a-z0-9A-Z]{2})([a-z0-9A-Z]{3})
([a-z0-9A-Z]{3})")
string s="949123U0456789";
Regex r=new Regex(@"(\w{3})(\w{3})(\w{2})(\w{3})(\w{3})");
Console.WriteLine(r.Replace(s,"$1.$2-$3-$4.$5"));
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