Questions to Regex guru's

[niccolo]

1. How to find repeatable text patterns divided by exactly on not exactly known number of charaters – or how to use back references in find exp.

Example of pattern I need to run
([abdfz]{4})(.{5,10})1 — where 1 is that what is found with ([abdfz]{4})

2. How with regex (if it’s possible) in text pattern like that

aaa
t~ bbb
t~ ccc
abb
t~ddd
abd
acd

replace first two “~” with aaa and third “~” with abb in SINGLE run, because there can be more than thousand of tabbed lines.

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