parsing - Getting tokens based on length and position inside input -


on input have stream of characters not separated delimiter, this:

input = "150001"

i want make parser(using jison), tokenize based on position , length, should tokens:

15 - system id (first 2 numbers) 0001 - order num (4 numbers after)

can give me advice how can accomplish this, tried add tokens this:

    %lex     %%       [0-9]{2}    return "system_id"      [0-9]{4}    return "order_num"     \lex    %%

but expected not working :)

is there way parse kind of inputs, parse length of characters ?

you can make simple parser using state-declarations, , assigning state each of rules. referring jison's documentation, change (noting lexer still incomplete because nothing identifier or "="):

%lex  %s system_id order_num %%  /* more logic needed accept identifier, "=", each     own state, , beginning "system_id" state.   */  <system_id>[0-9]{2}    this.begin("order_num"); return "system_id"  <order_num>[0-9]{4}    this.begin('initial'); return "order_num"

\lex %%


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