Laravel RegEx for updating a form to show both old values while editing a form

gistfile1.txt

(value\=\"\{\{\ old\(\')([a-z\-\_]+)(\')(\)\ \}\}\")
usage: $1$2$3\,\ \$variableObject\->$2$4

works as long as:
$2 is the same key as the column name (or whatever is in the object coming back) 

see https://regex101.com/r/DfQngW/1