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#!/bin/bash
s='bob mary mike bill kim jim john'
perl -lane 'while (/(?=\b(\p{L}+\s+\p{L}+))/g) {print $1}' <<< "$s"

Success #stdin #stdout 0.01s 5540KB

stdin

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Standard input is empty

stdout

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bob mary
mary mike
mike bill
bill kim
kim jim
jim john

https://ideone.com/a46JXB

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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