"x-" is a special pattern. It does not mean an x followed by a hyphen. It means "0 or more "x" (but as few as possible)".
When you used a hyphen in your pattern, you meant the first, but Lua understands it as the second.
Similarly, [abc] is a pattern. It defines a character class, meaning one of a, b, or c.
When you used [, you meant it as a literal square bracket, but that's not how Lua understands it.
. is also a special character (meaning anything).
This one's probably not a problem, but it's also not what you mean. If there was a q there instead of a ., Lua would accept that.
You need to escape these special characters with %, such as %- or %[ or %.. This means that they are the literal character, e.g., %- matches a hyphen, not zero or more percent signs.
You can also use () to capture just the version, instead of using tostring and match
1 | [[<h1 class="game%-name" title="Defend! %[(%d+%.%d+%.%d+)%] %[Public InDev%]">Defend! %[0%.2%.5%] %[Public InDev%]</h1>]] |
