将字符串转换为标题大小写 [英] Transform string to title case

问题描述

我需要将以下内容转换为标题:

I need to convert to title case the following:

1. 短语中的第一个单词；

1. First word in a phrase;

在同一短语中的其他单词，其长度大于minLength.

Other words, in the same phrase, which length is greater than minLength.

我正在查看 ToTitleCase ，但是结果不是预期的.

I was looking at ToTitleCase but the result is not the expected.

因此，minLength = 2的短语汽车非常快"将变为汽车非常快"快速".

So the phrase "the car is very fast" with minLength = 2 would become "The Car is Very Fast".

我能够使用以下命令将第一个单词大写:

I was able to make the first word uppercase using:

Char[] letters = source.ToCharArray();
letters[0] = Char.ToUpper(letters[0]);

并得到我正在使用的单词:

And to get the words I was using:

Regex.Matches(source, @"\b(\w|['-])+\b"

但是我不确定如何将所有这些放在一起

But I am not sure how to put all this together

谢谢，米格尔(Miguel)

Thank You, Miguel

推荐答案

示例代码:

string input = "i have the car which is very fast";
int minLength = 2;
string regexPattern = string.Format(@"^\w|\b\w(?=\w{{{0}}})", minLength);
string output = Regex.Replace(input, regexPattern, m => m.Value.ToUpperInvariant());

更新(对于单个字符串中包含多个句子的情况).

UPDATE (for the cases where you have multiple sentences in single string).

string input = "i have the car which is very fast. me is slow.";
int minLength = 2;
string regexPattern = string.Format(@"(?<=(^|\.)\s*)\w|\b\w(?=\w{{{0}}})", minLength);
string output = Regex.Replace(input, regexPattern, m => m.Value.ToUpperInvariant());

输出:

I Have The Car Which is Very Fast. Me is Slow.

您可能希望处理！，?和其他符号，然后可以使用以下符号.您可以根据需要添加任意数量的句子终止符号.

You may wish to handle !, ? and other symbols, then you can use the following. You can add as many sentence terminating symbols as you wish.

string input = "i have the car which is very fast! me is slow.";
int minLength = 2;
string regexPattern = string.Format(@"(?<=(^|[.!?])\s*)\w|\b\w(?=\w{{{0}}})", minLength);
string output = Regex.Replace(input, regexPattern, m => m.Value.ToUpperInvariant());

更新(2)-将 e-marketing 转换为 E-marketing (将-视为有效词)符号):

UPDATE (2) - convert e-marketing to E-Marketing (consider - as valid word symbol):

string input = "i have the car which is very fast! me is slow. it is very nice to learn e-marketing these days.";
int minLength = 2;
string regexPattern = string.Format(@"(?<=(^|[.!?])\s*)\w|\b\w(?=[-\w]{{{0}}})", minLength);
string output = Regex.Replace(input, regexPattern, m => m.Value.ToUpperInvariant());

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