'How to inset dash between regex match?

I need to add - in between of regex match in text file. I tried this but no luck!

-L\d{1,2} # this match all I need

Sa-L1
Sa-L23

Desire output:

Sa-L-1
Sa-L-23

There are -L in the lines, but I want to change -L with digits.

regextxt


Solution 1:[1]

Use

(-L)(\d)

Replace with $1-$2 or \1-\2.

See regex proof.

EXPLANATION

--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    -L                       '-L'
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  (                        group and capture to \2:
--------------------------------------------------------------------------------
    \d                       digits (0-9)
--------------------------------------------------------------------------------
  )                        end of \2

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Ryszard Czech

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