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Merge pull request #13312 from zmstone/0621-fix-regex_extract-docs 

doc: fix regex_extract function doc
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zmstone 2024-06-26 10:48:40 +02:00 committed by GitHub
parent debad00e82 7f73f27d56
commit af9bfc21cb
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1 changed files with 9 additions and 5 deletions
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14
apps/emqx_utils/src/emqx_variform_bif.erl
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@ -199,20 +199,24 @@ regex_match(Str, RE) ->
regex_replace(SrcStr, RE, RepStr) -> regex_replace(SrcStr, RE, RepStr) ->
re:replace(SrcStr, RE, RepStr, [global, {return, binary}]). re:replace(SrcStr, RE, RepStr, [global, {return, binary}]).
%% @doc Searches the string Str for patterns specified by Regexp. %% @doc Non-global search for specified regular expression pattern in the given string.
%% If matches are found, it returns a list of all captured groups from these matches. %% If matches are found, it returns a list of all captured groups from these matches.
%% If no matches are found or there are no groups captured, it returns an empty list. %% If no matches are found or there are no groups captured, it returns an empty list.
%% This function can be used to extract parts of a string based on a regular expression, %% This function can be used to extract parts of a string based on a regular expression,
%% excluding the complete match itself. %% excluding the complete match itself.
%%
%% Examples: %% Examples:
%% ("Number: 12345", "(\\d+)") -> [<<"12345">>] %% ("Number: 12345", "(\\d+)") -> [<<"12345">>]
%% ("Hello, world!", "(\\w+)") -> [<<"Hello">>, <<"world">>] %% ("Hello, world!", "(\\w+).*\s(\\w+)") -> [<<"Hello">>, <<"world">>]
%% ("No numbers here!", "(\\d+)") -> [] %% ("No numbers here!", "(\\d+)") -> []
%% ("Date: 2021-05-20", "(\\d{4})-(\\d{2})-(\\d{2})") -> [<<"2021">>, <<"05">>, <<"20">>] %% ("Date: 2021-05-20", "(\\d{4})-(\\d{2})-(\\d{2})") -> [<<"2021">>, <<"05">>, <<"20">>]
-spec regex_extract(string() | binary(), string() | binary()) -> [binary()].
regex_extract(Str, Regexp) -> regex_extract(Str, Regexp) ->
case re:run(Str, Regexp, [{capture, all_but_first, list}]) of case re:run(Str, Regexp, [{capture, all_but_first, binary}]) of
{match, [_ | _] = L} -> lists:map(fun erlang:iolist_to_binary/1, L); {match, CapturedGroups} ->
_ -> [] CapturedGroups;
_ ->
[]
end. end.
ascii(Char) when is_binary(Char) -> ascii(Char) when is_binary(Char) ->