Question related to REGEX  functions

Hi,
I am working on Oracle 10gR2.
I am working on a column which stores username. Let's say that one of the values in this column is "Ankur". I want to fetch all records where username is a concatenated string of "Ankur" followed by some numerical digits, like "Ankur1", "Ankur2", "Ankur345" and so on. I do not want to get records with values such as "Ankurab1" - that is anything which is concatenation of some characters to my input string.
I tried to use REGEX functions to achieve the desired result, but am not able to.
Can anyone help me here?
Best,
Ankur

Her is one way.
SQL> with sample_data as (
  2    select 'Ankur1' str from dual union all
  3    select 'Ankur2'  from dual union all
  4    select 'Ankur345' from dual union all
  5    select 'Ankurab1' from dual)
  6  select str from sample_data
  7  where regexp_replace(str, '[0-9]+$') = 'Ankur';
STR
Ankur1
Ankur2
Ankur345John

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