Regex string: specific requirement -

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i trying regex string right don't seem working should.

i have numeric field should have 5 digits. digits can start 04xxx , 5xxxx

this string not covering completly: 

/[05][0-9][0-9][0-9][0-9]/

it forces start 0 or 5 followed 4 digits, allows example 012345

any ideas?

try regex pattern:

^(04|5\d)\d{3}$

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