Match a specific string that is a substring of a another string

Question

I have the following code

// the values for the input and the pattern 
// are combinations of R, NR and HR
var input = "NR|HR"; 
var pattern = "R";

var isMatch = Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase);

this returns true because NR and HR contains an R

Is there some way I can do an exact match for R with Regular Expressions?

Do you actually require regular expression? Why don't you simply do var containsR = input.Split('|').Contains('R')? — Steve B
– Steve B, Commented May 17, 2013 at 14:23

anubhava · Accepted Answer · 2013-05-17 14:03:55Z

4

You can use word boundaries:

var pattern = "\bR\b";

answered May 17, 2013 at 14:03

anubhava

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Christian Lennartsson · Accepted Answer · 2013-05-17 14:16:05Z

0

Start of string ^ and End of string $

var pattern = "^R$";

answered May 17, 2013 at 14:16

Christian Lennartsson

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1 Comment

iruvar Over a year ago

doesn't handle R|HR though

iruvar · Accepted Answer · 2013-05-17 14:17:12Z

0

Try the following:

'(^R\|)|(\|R$)|(\|R\|)|(^R$)'

It picks our R from the following

R|NR
NR|R
R

but not the following

HR|NR
HR

answered May 17, 2013 at 14:17

iruvar

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