How do I use Find/Replace with a backreference followed by a number?

Question

I want to do a find/replace on the string matching (abcdefg)1 with \12, but it doesn't work. How do I do it?

Answer 1

Add a leading zero to the backreference:

\012

References

• Example: Regular Expression Matching a Valid Date

• How do you get a literal digit after a backreference in the search pattern