CODEWITHSUNDEEP
regex
tyu
tyu

Reputation: 1

Regular expression pattern in c#

I need to validate the following string

case 1: 123E

The first three are numeric and then the alphabet.

I have created the following pattern

var pattern = @"^[0-9]{2}[a-zA-Z]{1}"

Is this correct?

Upvotes: 0

Views: 50

Answers (2)

JvdV
JvdV

Reputation: 76000

You were close, as per my comment you can use:

^\d{3}[a-zA-Z]$

See the online demo

  • ^ - Start string anchor.
  • \d{3} - Three digits where \d is shorthand for [0-9]1
  • [a-zA-Z] - A single alpha char.
  • $ - End string anchor.

See a working .Net example here

1: This would only be the case if the ECMAScript flag is enabled. Otherwise \d is matching non-ascii digits as per this link. Thanks @WiktorStribiżew for noticing.

Upvotes: 1

Sergio
Sergio

Reputation: 65

Something like that should work: ^[0-9]{3}[a-zA-Z]$ You put {2} for numbers but in your case there are 3 of them so I wrote {3} instead. You don't need to write {1} because [a-zA-Z] is enough to find exacly one letter. I also added endline tag $ to ensure that there are no more symbols after letter.

Upvotes: 1

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