# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/\b[A-Za-z2]+(?=\()(?![^']*'!)/6/g;t' <<< "=VLOOKUP($A9,'Summary'!$A$10:$C$30,3,FALSE)
=IFERROR((C10/B10),\"N/A\")
='New Chart Data (Date)'!L70
=IFERROR((C10/B10),Len(E30))
='New Chart Data(Date)'!L70 + (Len(5)&ROW())
=INDEX(C$3:C$12,MATCH(9^99,IF(MAX(IF(ABS($B$3:$B$12-$B18)=MIN(IF($A$3:$A$12=$A18,ABS($B$3:$B$12-$B18),999)),B$3:B$12))=IF(ABS($B$3:$B$12-$B18)=MIN(IF($A$3:$A$12=$A18,ABS($B$3:$B$12-$B18),999)),B$3:B$12),IF(ABS($B$3:$B$12-$B18)=MIN(IF($A$3:$A$12=$A18,ABS($B$3:$B$12-$B18),999)),C$3:C$12))))"
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html