Matching a pattern in a string

Question

I have a string

string str = "I am fine. How are you? You need exactly 4 pieces of sandwiches. Your ADAST Count  is  5. Okay thank you ";

What I want is, get the ADAST count value. For the above example, it is 5.

The problem here is, the is after the ADAST Count. It can be is or =. But there will the two words ADAST Count.

What I have tried is

var resultString = Regex.Match(str, @"ADAST\s+count\s+is\s+\d+", RegexOptions.IgnoreCase).Value;
var number = Regex.Match(resultString, @"\d+").Value;

How can I write the pattern which will search is or = ?

try [is|=] instead of just is.

Zohar Peled
– Zohar Peled

2017-07-27 09:11:09 +00:00
Commented Jul 27, 2017 at 9:11 — Zohar Peled
– Zohar Peled, Commented Jul 27, 2017 at 9:11

Wiktor Stribiżew · Accepted Answer · 2017-07-27 09:13:09Z

2

You may use

ADAST\s+count\s+(?:is|=)\s+(\d+)

See the regex demo

Note that (?:is|=) is a non-capturing group (i.e. it is used to only group alternations without pushing these submatches on to the capture stack for further retrieval) and | is an alternation operator.

Details:

ADAST - a literal string
\s+ - 1 or more whitespaces
count - a literal string
\s+ - 1 or more whitespaces
- (?:is|=) - either is or =
\s+ - 1 or more whitespaces
(\d+) - Group 1 capturing one or more digits

C#:

var m = Regex.Match(s, @"ADAST\s+count\s+(?:is|=)\s+(\d+)", RegexOptions.IgnoreCase);
if (m.Success) {
    Console.Write(m.Groups[1].Value);
}

answered Jul 27, 2017 at 9:13

Wiktor Stribiżew

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1 Comment

Noor A Shuvo Over a year ago

Thanks! Thank for the explanation :). Another thing, what it mean by Group 1 in (\d+) ?

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