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Dictionary

• Input signal -> Concat signal_in_1 (& 2) -> Regex signal_in
  
• ^(.*); matches the input up to first ; as capture group 1. (.*;)* is for repeated key_n=val_n; until before the matching key. \1 is group 1 value (the key) matched at the start. =(?<val>.*?); outputs the value of the matched key (between key= and ;) to capture group val.
  
• Wire the input to concat signal_in_1 and anything to concat signal_in_2 such as the input again (to both signal_in_1 & 2).

• It additionally maps the key range to its order such as 1st = 1, 2nd = 2 etc to retrieve the value by the mapped key.
  
• \d{n} matches n digits in the example, so '1' = val1, '11' = val2, ''111' = val3, ''123' = val3, 'key4' = val4
  
• Extend by adding new key range such as (\d{4}) with (?(4)4) = ^(?:(\d{1})|...|(\d{4}));(.*;)*((?(1)1)|...|(?(4)4))=(?<val>.*?);.
  
• You can name each key's capture group to make it clearer ^((?<k1>\d{1})|...|(?<k4>\d{4}));(.*;)*((?(k1)1)|...|(?(k4)4))=(?<val>.*?);

• (?<i>.*) matches any non range key as the "i"nput named capture group. (?(i)\k<i>) is the input as the key from the "i" capture group without mapping.
  
• If an input or key isn't in a range and is a number of a capture group, then you need to either place it at the corresponding capture group or map it to another value.

Example Usage: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3400886610