正则表达式从句子C＃中切出单词

Question

I have some sentences that I would like to extract some words by Regex in C#

Example like:

// Standard room 1 persons from 18/03/2014 to 19/03/2014

Get the "Standard room 1 persons" out of the sentence, remove from xxxx to xxxx

// Family night room 3/4 from 18/03/2014 to 19/03/2014

Get the "Family night room" and 3/4 is the number of persons in the room and I would like to take the 4 out to be a maximum number of person in the room.

For both cases, the from and to are ignored.

Could you please suggest me the reg ex pattern to do those things ( 2 cases )?

Thank you very much and have a nice day!

Answer 1

If you don't insist on Regex:

string[] array1 = "Standard room 1 persons from 18/03/2014 to 19/03/2014".Split();
string[] array2 = "Family night room 3/4 from 18/03/2014 to 19/03/2014".Split();

string n = String.Join(" ", array1.TakeWhile(s => s != "from").ToArray());
string n2 = String.Join(" ", array2.TakeWhile(s => s != "from").ToArray());

Console.WriteLine(n);  // Standard room 1 persons 
Console.WriteLine(n2); // Family night room 3/4 

Answer 2

Simply use this:

string s = "//Standard room 1 and 1/4 persons from 18/03/2014 to 19/03/2014";
            string matchedStr = Regex.Match(s, ".*(?=from)(?=.*to)").Value;
            Console.WriteLine(matchedStr);
            string totalStr = Regex.Match(s, ".*(?=from)(?=.*to)").Value;
            int total=Convert.ToInt32(Regex.Match(totalStr,@"(?<=\d/)\d").Value);
            Console.WriteLine(total);

Answer 3

Sample code:

string input = "Standard room 1 persons from 18/03/2014 to 19/03/2014"
string s = Regex.Match(input, "(.*)(?=from)").Value;
s = s.Trim();

// Get your maximum number
MatchCollection numbers = Regex.Matches(s, "[\d]");
int max = 0;
foreach (Match number in numbers)
{
     int temp = int.Parse(number.Value);
     if (max > temp)
        max = temp;
}