asked on

to extract last digits from a string

How can I extract last four digits from a string "abc1234567"

For eg: I have text box wherein a user can fill his account number.

I need to save last 4 digits of Account number in another string.

How can I do this?

Looks like it is a simple problem. Would appreciate any help!

Thanks a lot

SOLUTION

exalkonium

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exalkonium

oops, thats php

SOLUTION

ad5qa

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Cem Türk

mid("abc1234567",len("abc1234567")-4,4)

newaspdotnet

ASKER

Thanks alot for replying!

I used this and it is giving the exact o/p

origString = "abc1234567"
newString = origString.Substring(origString.Length - 4,4)

SOLUTION

Jaime Olivares

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Jaime Olivares

the second argument in substring is not necessary

newaspdotnet

ASKER

Yes jaime,

Even if I use newString = origString.Substring(origString.Length - 4) it is giving the same o/p.

So this has confused me. Shall I use the 2nd argument now or not. Both gives the same o/p.

So which one to be used.

Thanks!

ASKER CERTIFIED SOLUTION

Jaime Olivares

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Fernando Soto

Hi newaspdotnet;

How about a 1 liner.

using System.Text.RegularExpressions;

String input = "abc1234567";
String Last4Digits = Regex.Match(input.Trim(), @"^.*?(\d{4})$").Groups[1].Value;
MessageBox.Show(Last4Digits);

Fernando