how to work backwards?

[martib]

hi,

i have different lines like

here and there some text 4598
45 eref ereo and more more

i want to replace the last space with |
so the output should be

here and there some text|4598
45 eref ereo and more|more

(and later maybe the second last space)

[ben_josephs]

To replace the last space with |:

Find what: (.*)-([^-]+)$ [Replace the hyphens with spaces]
Replace with: \1|\2

[X] Regular expression

To replace the second last space with |:

Find what: (.*)-([^-]+-[^-]+)$ [Replace the hyphens with spaces]
Replace with: \1|\2

[X] Regular expression

These assume you are using Posix regular expression syntax:

Configure | Preferences | Editor

[X] Use POSIX regular expression syntax