regex substring match with a pattern

Question

I have a RegEx Patern like

    string _pattern = @"\d{4}-\d{2}\/\d{2}\/\d{4}";

How do I check if a string value belongs to this pattern in full or is part of this pattern.

for e.g if i send

        string someString= "0007-08/02/2012";
        Match m = Regex.Match(someString, _pattern);
        //i get a full match

but if i send

        string someString="0007-"
        //how do i check if this string value matches that pattern and is a substring.

Is there any other way of doing it ,other than using regex.

Thanks, csk

Your second example does not match the pattern.

Oded
– Oded

2012-10-10 10:52:39 +00:00
Commented Oct 10, 2012 at 10:52 — Oded
– Oded, Commented Oct 10, 2012 at 10:52

Inm0r74L · Accepted Answer · 2012-10-10 11:16:27Z

1

If you want to match any substring of your pattern you has to add '?' in all of the optionals, something like this:

string _pattern = @"(\d{4})?(-)?(\d{2})?(\/)?(\d{2})?(\/)?(\d{4})?";

This pattern will match any substring of you original pattern.

i.e.: 
0007-08/02/2012
0007-
08/02/2012
08/
/02/2012

All of that matches the pattern.

edited Oct 10, 2012 at 11:16

answered Oct 10, 2012 at 10:51

Inm0r74L

2051 silver badge8 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Inm0r74L Over a year ago

Yes, you're right ( ) arround expression are missing in my answer, i'll edit it.

LTAcosta Over a year ago

This allows for many other matches though. Things like "-/21/" or "2345-/" would match here.

srcKode Over a year ago

Cool ! I tried it with '?' and the braces '()' separately.Your solution works.Thanks.

srcKode Over a year ago

@LTAcosta to avoid those kind of matches I grouped them as desired like @"(\d{4}-)?(\d{2}\/\d{2}\/\d{4})?" separating the date part from the first 5 characters.

LTAcosta Over a year ago

Yeah, that is what I was going to suggest, but I was unsure of your requirements. I wasn't sure which parts of your string would always occur, and which would only occur sometimes. Like that won't work properly for just 4 digits, since the 4 digits are tied to the -. If you needed to support both cases, you can | all the possible scenarios, or you can probably use an alteration construct.

Danilo Vulović · Accepted Answer · 2012-10-10 10:52:30Z

0

string _pattern = @"\d{4}-(\d{2}\/\d{2}\/\d{4})?"

answered Oct 10, 2012 at 10:52

Danilo Vulović

3,06324 silver badges31 bronze badges

Comments

xing · Accepted Answer · 2012-10-10 11:00:41Z

0

My suggestion is to postfix someString with a string known to match the pattern and test it:

string good = "0007-08/02/2012";
bool isMatch = Regex.Match(someString + good.Substring(someString.Length), _pattern)

answered Oct 10, 2012 at 11:00

xing

4472 silver badges6 bronze badges

Collectives™ on Stack Overflow

regex substring match with a pattern

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related