Question

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How to concatenate $1 with number in a regex

I am trying to replace all instances of SomeText in my file with SomeText2 using a simple regex replace from the command line (on Windows):

perl -pi.bak -e "s/(SomeText)/$12/g" sometext.txt

This doesn’t work because there is no $12 selection. How can I properly indicate the $1 selection token without a space after it?

Answer 1

${1}

As a general rule, inside a Regexp or interpolated string literal, you can use {} after any $ or @ sigil to explicitly delimit the name of the variable you care about.

And yes, as @Mat says, if you’re on a Unix system of some kind, use single quotes.