regex to refactor elseif block to select case format

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Requirement from work was to refactor an 8000 line if elseif code block to select case syntax. Not a manual task, even for a 1984 olympics button bashing champ.

note, id is the test variable here,
as in
elseif (id ="test") then ...

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  1. search for: elseif\s*\(\s*id\s*=\s*([0-9]+)\s*\)\s*then
  3. replace with: case "$1" \n

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