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$s = 'abc 1 23 do 456 re 789 me 0123 456 2 23 456 789 0123 456';

...
# This has 2 digits: 23
# This has 3 digits: 456
# This has 3 digits: 789, etc.

$s = '1 23 456 789 0123 456 2 23 456 789 0123 456';

...
# Prints:
# This looks like a word: 1 23 456
# This looks like a word: 2 23 456