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the phone number should be
10 numeric digits, must start with 04 or 02

What I have tried:

Im a new learner to regex so I don't really know how to get started with this
Updated 14-Apr-21 5:52am

Im a new learner to regex so I don't really know how to get started with this

What have you done so far ? Are you able to make a RegEx validationd 1 single digit ? 2 digits ? more
Show your work and explain where you are stuck.

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre -[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx: Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx: Regexper[^]
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But that shouldn't be difficult even for a beginner. Get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.
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