Replace all of line after specified string?

[emendelson]

I understand how to use StringReplace for simple replacements, but I would be grateful for any help in solving this problem.

I want to search a file for a line that begins

Output=

and replace everything to the RIGHT of the equals sign with the contents of a variable.

I think I need to use a regular expression search to find the string between "Options=" and the CR/LF at the end of the line and then replace that string or the whole line. But I can't figure out the exact technique.

Thanks for any help with this.

[enaiman]

_FileReadToArray

For every element in that array:

If StringLeft($array[$i], 7) = "Output=" Then
 $array[$i] = "Output="&$myVar
EndIf

Once this is done, use _FileWriteFromArray to have the new content saved to a new file.

[GEOSoft]

$sStr = FileRead("Somefile,txt")
$sVar = "Some Replacement String"
$sStr = StringRegExpReplace($sStr, "(?m:^)(?i)(.*output=).+", "$1" & $sVar)

[emendelson]

Both of those solutions are perfect, and it would have been a very long time before I thought of either of them on my own. Many thanks to you both!