We allow users to easily create circom circuit to reveal subgroup. After the steps shown on frontend, we can deal with our newly baked circom circuit by

component main { public [msg, match_idx] } = Regex(max_msg_byte,max_reveal_byte,group_idx);

where msg is the whole text, match_idx is to tell which occurance of a certain subgroup match we are interested in, and group_idx is to tell which subgroup we are interested in.

For Dev:

regex_submatch_simplified

Simplified version regex_submatch

Input: regex, submatches, text Output: Return circom that allows us to reveal a specific submatch we defined through frontend.

Data flow and related functions

User type regex format like regex = "DKI: (([vad]=([12\/]+); )+)bh"
Frontend process this regex, by simp_regex = gen_dfa.simplifyRegex (to deal with escape and change [] into or statements), then let users high light start and end of each group (inclusive) of this simp_regex. Save the value as submatches e.g. const submatches = [ [5, 30], [7, 13], [15, 25], ];
Match all the strings that satisfies regex as a whole. ฺ(like previously version) Run const simp_graph = gen_dfa.simplifyGraph(regex); const matched_dfa = gen_dfa.findSubstrings(simp_graph, text); for (const subs of matched_dfa[1]) { var matched = text.slice(subs[0], subs[1] + 1);} Very important of +1!!
Now for each matched, we start extract substring state (we can have multiple matched values!)

const tagged_simp_graph = gen_tagged_dfa.tagged_simplifyGraph(regex, submatches); var final_graph = gen_tagged_dfa.findMatchStateTagged(tagged_simp_graph); var allTags = final_graph["tags"]; var transitions = final_graph["transitions"];
For Circom, we run gen_tagged_dfa.formatForCircom(final_graph); --> return { forward_transitions: forward_transitions, rev_transitions: rev_transitions, };
For frontend, will need to show that this stuff really correct. Look at gen_tagged_dfa.finalRegexExtractState

[Optional]

Show final regex matching and what submatches become after expanding +, by running: after_plus = gen_dfa.simplifyPlus(simp_regex, submatches). var final_regex = after_plus["regex_show"]; var final_submatches = after_plus["final_submatches"]; i.e.[ [ [ 5, 65 ] ], [ [ 7, 13 ], [ 36, 42 ] ], [ [ 15, 31 ], [ 44, 60 ] ] ] (inclusive)
Show the full tagged DFA, with its corresponding state transition that belong to each tag.