Question

i am trying to write a regular expression so i can replace following phone numbers with a link:

first
+45 55 44 33 22
second
+4555443322
third
+45 55443322
fourth
55443322
and last
55 44 33 22

currentley my regular expression looks like this:

Regex phoneRegex = new Regex(@"[0-9]{8}", RegexOptions.IgnoreCase);
Regex phoneRegexInternation = new Regex(@"(?:\+\[0-9]{10})", RegexOptions.IgnoreCase);
Regex phoneRegexwithSpace = new Regex(@"[0-9]{2}\s*[0-9]{2}\s*[0-9]{2}\s*[0-9]{2}", RegexOptions.IgnoreCase);
Regex phoneRegexInternationWithSpaceAfterAreaCode = new Regex(@"(\+?[0-9]{2})\s*[0-9]{8}", RegexOptions.IgnoreCase);
Regex phoneRegexwithSpaceInternational = new Regex(@"(\+?[0-9]{2})\s*[0-9]{2}\s*[0-9]{2}\s*[0-9]{2}\s*[0-9]{2}", RegexOptions.IgnoreCase);

but my result i this

first +Acceptere opgaven for at se telefonnummer. 22 second +Acceptere opgaven for at se telefonnummer.22 third +45 Acceptere opgaven for at se telefonnummer. fourth Acceptere opgaven for at se telefonnummer. and last Acceptere opgaven for at se telefonnummer.

"Acceptere opgaven for at se telefonnummer" is a danish expression for accept the assignment to see the phonenumber and it's a link, but as you can se it's not hiding the plus sign and a few of the numbers correctley.

anyone that can help?

Answer 1

var input = @"first
+45 55 44 33 22
second
+4555443322
third
+45 55443322
fourth
55443322
and last
55 44 33 22";

var regex = new Regex(@"(?<inter>\+45\s?)?(?<part1>\d{2})\s?(?<part2>\d{2})\s?(?<part2>\d{2})\s?(?<part4>\d{2})");
var matches = regex.Matches(input);

var output = new StringBuilder();
var lastindex = 0; 
var index = 0;
foreach (Match m in matches){
    index = m.Index;
    output.Append(input.Substring(lastindex, index - lastindex));

    var phone = $"+45{m.Groups["part1"]}{m.Groups["part2"]}{m.Groups["part3"]}{m.Groups["part4"]}";
    output.Append($"<a href=\"#\" data-original=\"{m.Value}\" data-generic=\"{phone}\">Acceptere opgaven for at se telefonnummer</a>");

    lastindex = m.Index + m.Length;
}

Console.WriteLine(output.ToString());

结果是：

first
<a href="#" data-original="+45 55 44 33 22" data-generic="+45553322">Acceptere opgaven for at se telefonnummer</a>
second
<a href="#" data-original="+4555443322" data-generic="+45553322">Acceptere opgaven for at se telefonnummer</a>
third
<a href="#" data-original="+45 55443322" data-generic="+45553322">Acceptere opgaven for at se telefonnummer</a>
fourth
<a href="#" data-original="55443322" data-generic="+45553322">Acceptere opgaven for at se telefonnummer</a>
and last
<a href="#" data-original="55 44 33 22" data-generic="+45553322">Acceptere opgaven for at se telefonnummer</a>

Answer 2

如果没有看到你如何应用这些正则表达式，很难确定你在做什么。了解您期望看到的内容也很有帮助。那就是说，我会尽力回答。

基于正则表达式，输入和输出，您可能无意中将错误的正则表达式应用于错误的输入。如前所述，我们无法确切知道您是如何使用它们的。请注意，phoneRegexWithSpace将匹配第一个输入，除了+和22，它们都会在输出中弹出不需要的内容。

要纠正它，你可以做一些事情：

确保每个表达式仅匹配您要匹配的特定案例。您可以使用后视和前瞻来帮助解决这个问题。请参阅：https://www.regular-expressions.info/lookaround.html
制作一个可以匹配任何排列的正则表达式。例如，您可以将前缀设为可选，以将phoneRegexWithSpace与phoneRegexwithSpaceInternational结合使用
如果您一次测试一个号码，请确保先与更具包容性的表达式匹配。例如，在测试phoneRegexWithSpace之前测试phoneRegexwithSpaceInternational

Regular expression with danish phone number

2 个答案: