utf8 codepoint regex
mitchell edited this page Sep 18, 2020
·
1 revision
Textadept uses TRE as its regex engine for text searches. Unfortunately, TRE does not allow for easy searching of UTF-8 codepoints (e.g. U+2318). Normally, UTF-8 codepoints would have to be broken up into their individual bytes and searched for separately (e.g. \xe2\x8c\x98). Adding the following to your ~/.textadept/init.lua extends regex syntax to silently convert "\u{codepoint}" sequences into the individual byte sequences needed by TRE. Thus a search like "\u{2318}" would work as expected.
local overriding_find = false
events.connect(events.FIND, function(text, next)
if not overriding_find and ui.find.regex then
-- Substitute \u{codepoint} with \xXY byte sequences needed by TRE.
text = text:gsub('\\u{(%x+)}', function(codepoint)
local char = utf8.char(tonumber(codepoint, 16))
return string.rep('\\x%X', #char):format(char:byte(1, #char))
end)
overriding_find = true
events.emit(events.FIND, text, next)
overriding_find = false
return true -- prevent normal 'find' handling
end
end, 1)