perl - If a sentence starts with a specific word, how to change a word in that sentence if it does exist? -

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so, searching lines in .txt file , if starts word such "this", how swap targeted word in sentence if exist? open doing bash, perl or awk.

perl -pi -e "s/^this\b/that/" myfile

or, if want change different word within line,

perl -pi -e "s/\btargeted\b/swap/ if /^this\b/" myfile

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