[Rpm-maint] [rpm-software-management/rpm] Any way to work around %gsub's (Lua-originating) escaping requirements regarding the input string? (Discussion #3826)

[Frank Dana]

Aaaand, I just realized I'm not actually _escaping_ the periods in the source string at all, I'm just still doing pattern substitution with `.` wildcards:

```lua
> string.gsub("1\\_2\\_3", "\\.", ",")
1,2,3	2
```

...So if I can figure out the correct way to _actually_ quote the pattern period, it'll probably work without manipulating the source string. But what _is_ the correct way? A single backslash doesn't do it, that's a syntax error:

```lua
> string.gsub("1.2.3", "\.", "_")
stdin:1: invalid escape sequence near '"\.'
```

Ah. That should've been obvious, my bad:

```lua
> string.gsub("1.2.3", "%.", "_")
1_2_3	2
```

...Neeeeevermind.

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