CODEWITHSUNDEEP
c#regex
Glenn Boserup Møller
Glenn Boserup Møller

Reputation: 37

regex find exact word/sentences match

I have a linq list with "impportent words" which holds sentences and single words.

I need to find if there is any word or sentences from importent_words which is found in "sentence_to_search_for_importent_word"

At last the result should end up in a array or something.

here is what i done until know..

List<string> importent_words = new List<string>() {"age", "what is", ".", "pages"}

string sentence_to_search_for_importent_words = "what is your age.";

I need to find the importent_words in a sentence and get all the matches outputted to a list

I try this but it does not really do the job

var pattern = new Regex(@"\w+");
var qa = pattern.Split(first_sentence.ToLower()).Where(w => importent_words.Contains(w));

It have to return "age" not "ages" also it should find "what is" not only "what"

With \w it seems to find age but it only output "this" instead of "this is"

It seems like the problem is that "this is" is more than one word.

Upvotes: 0

Views: 750

Answers (2)

Thor
Thor

Reputation: 498

Just in case you'd like an extendable regex solution. The matches need to be escaped for the regex pattern. You could utilize Regex.Escape() for this.

List<string> importent_words = new List<string>() { "age", "what is", @"\.", "ages", "bob" };
string sentence_to_search_for_importent_words = "what is your age. Frank";
string regexString = string.Join("|" , importent_words.ToArray());
Regex wordRegex = new Regex(regexString);

string[] result = wordRegex.Matches(sentence_to_search_for_importent_words)
    .Cast<Match>()
    .Select(m => m.Value)
    .ToArray();

Upvotes: 0

Sayse
Sayse

Reputation: 43300

If all you're looking for is the important words that appear in your sentence then you can just use 

importent_words.Where(x => sentence.Contains(x))

If this needs to be case insensitive then you can find a replacement for the Contains(x) from the answers to Case insensitive 'Contains(string)' (or use sentence.ToLower() as you show in your current regex attempt)

Upvotes: 4

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