54 lines
1.0 KiB
Lua
54 lines
1.0 KiB
Lua
-- A simple wrapper for PCRE that uses a cache for compiled expressions.
|
|
|
|
_regex_cache = {}
|
|
|
|
_regex_cache.mt = {}
|
|
setmetatable(_regex_cache, _regex_cache.mt)
|
|
|
|
|
|
_regex_cache.mt.__index = function (self, key)
|
|
local _, _, pattern, cflags = string.find(key, '^(.*)%z(.*)$')
|
|
|
|
local _, compiled = ifre.compile(pattern, tonumber(cflags))
|
|
|
|
self[key] = compiled
|
|
|
|
return compiled
|
|
end
|
|
|
|
|
|
function regex_search(pattern, subject, cflags, eflags)
|
|
_check_required(pattern, 'string')
|
|
_check_required(subject, 'string')
|
|
_check_optional(cflags, 'table')
|
|
_check_optional(eflags, 'table')
|
|
|
|
if (cflags == nil) then
|
|
cflags = {}
|
|
end
|
|
|
|
if (eflags == nil) then
|
|
eflags = {}
|
|
end
|
|
|
|
local flags = ifre.flags()
|
|
|
|
cf = 0
|
|
for _, f in ipairs(cflags) do
|
|
cf = cf + flags[f]
|
|
end
|
|
|
|
ef = 0
|
|
for _, f in pairs(eflags) do
|
|
ef = cf + flags[f]
|
|
end
|
|
|
|
local compiled = _regex_cache[pattern .. '\0' .. cf]
|
|
|
|
if (compiled == nil) then
|
|
return nil
|
|
end
|
|
|
|
return ifre.exec(compiled, subject, ef)
|
|
end
|