C# REGULAR EXPRESSION TO GET WORDS BETWEEN 4 TO 10 CHARACTERS

Takeshi Okada

Total Post:89

Points:629
Posted by  Takeshi Okada
C# 
C#
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I am trying to get all the words in a string, that are at least 4 characters long and less than 10 characters. When I use the following regular expression, it just returned the whole string as one word. Can you please look at the following example and tell me how should I write this regular expression?

string result = "Overfishing, erosion and warmer waters are feeding jellyfish blooms in coastal regions worldwide. And they're causing damage"

string[] words = Regex.Split(result, @"[\W]{4,10}");

foreach (string line in words)

{

    Console.WriteLine(line);

}

  1. Pravesh Singh

    Post:412

    Points:2888
    Re: C# regular expression to get words between 4 to 10 characters

    Hi Takeshi,

    Your code isn't working because the pattern will only match a sequence of 4 to 10 consecutive non-word characters, which doesn't appear in the string. So Regex.Split just returns an array containing the original string.

    Try using this pattern:

    \b\w{4,10}\b

    For example:

    string[] words = Regex.Matches(result, @"\b\w{4,10}\b")

                          .Cast<Match>()

                          .Select(m => m.Value)

                          .ToArray();

    This will match any sequence of 4 to 10 consecutive word characters, surrounded by word boundaries.

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