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#!/bin/bash
s="... So in the figure 3-12 we see ... similar to figure 3-1..."
echo $s | sed -E 's#(figure +)([0-9-]+)#\1\\ref{fig:\2}#g'

Success #stdin #stdout 0s 19616KB

stdin

Standard input is empty

stdout

... So in the figure \ref{fig:3-12} we see ... similar to figure \ref{fig:3-1}...

https://ideone.com/1EjNRa

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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