To further generalize...
Suppose the alchemist want to change two base metals to one precious metal.
With this InFile ...
Code:
m1_IRON some other text m2_IRON
p2_LEAD yet more text p2_IRON extra text
change is good hello_LEAD
... this code ...
Code:
BaseMetal1='IRON'
BaseMetal2='LEAD'
PreciousMetal='GOLD'
sed -r 's/([[:alnum:]]+)_('$BaseMetal1'|'$BaseMetal2')/'$PreciousMetal'_\1/g' <$InFile >$OutFile
... produces this OutFile ...
Code:
GOLD_m1 some other text GOLD_m2
GOLD_p2 yet more text GOLD_p2 extra text
change is good GOLD_hello
Daniel B. Martin
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