Force immediate evaluation of backreference during replace

Question

I am running into an error where I am concatenating strings together to obtain the field I want replaced.

Below is an example of what my script is doing:

Answer 1

1st, missing the point, answer replaced...

When concatenate '$1' and '6Q' (before being passed to the regex engine) you get $16Q and there is no 16^th capture to replace.

To avoid this, use named groups in the match ((?<name>)) and ${name} in the replacement string.

See the documentation, and note:

If number does not specify a valid capturing group defined in the regular expression pattern, $number is interpreted as a literal character sequence that is used to replace each match.

Answer 2

You can also try using named capture groups:

$rx = '(?i)(?<Beg>.*)\$\(STRINGTOREPLACE\)(?<End>.*)'
$texttoreplacewith='${Beg}6Q${End}'
$x = "abc`$(stringtoreplace)xyz"

[regex]::Replace($x, $rx, $texttoreplacewith)