Search code examples
c#regexregular-language

Small trouble with a regular expression

I need to build a regular expression, with the following details. The regular expression needs to match in the following chars structure:

OT-001-16

  1. OT: They may be uppercase or lowercase, but I only need to match if it is O followed by T, not T and followed by O.
  2. - Followed by this character.
  3. 001 Followed by 3 or more numbers.
  4. - Followed by this character.
  5. 16 And finally followed by exact 2 numbers.

This is what I've tried:

/([OT|ot]{2})-(\d{3,})-(\d{2})/g

This regular expression works fine, except if I write TO-0052-54, the problem is with the OT chars, I need to match only if a O is followed by T.

Thanks and any question post on comments.

Solution

  • by using [OT|ot]{2} you are actually comparing a string that has char O or o and T or t of length 2. It is like using something like this.

    [ABCD]{2} : where it matches all the possibles combinations of characters.

    To solve this, use (OT|ot) which matches between this particular pattern OT or ot.