I'm trying to match and replace strings of the form
mystring = "string-text"
with
mystring = "XYZ string-text"
if and only if string-text is not equal to red. For example
original-text replacement
------------- -----------
mystring = "red" mystring = "red"
mystring = "green" mystring = "XYZ green"
mystring = "blue" mystring = "XYZ blue"
mystring = "reds" mystring = "XYZ reds"
mystring = "_red" mystring = "XYZ _red"
mystring = "1ed" mystring = "XYZ 1ed"
mystring = "ree" mystring = "XYZ ree"
mystring = "" mystring = "XYZ "
mystring = "12345678" mystring = "XYZ 12345678"
mystring = "red" is left untouched and all others are replaced as described. Does there exist a regular expression to achieve this?
The best I could manage is
^mystring = "(?!red)(.*)"$
The capturing group (.*) allows replacement to be printed with mystring = "XYZ \1". This works in most cases but fails for the testcase mystring = "reds"
This is slightly hacky, but you can include the ending quotation mark in the lookahead then in the actual match pattern:
^mystring = "(?!red")(.*)"$
Where the substitution is:
mystring = "XYZ $1"