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#!/bin/bash
s='(888) 747-7424'
sed -E 's/^(([^0-9]*[0-9]){2}[^0-9]*)([0-9])(([^0-9]*[0-9]){4}[^0-9]*)([0-9])/\1\6\4\3/' <<< "$s"

Success #stdin #stdout 0s 4544KB

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Standard input is empty

stdout

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(884) 747-7824

https://ideone.com/vWFNEf

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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