how to parse a data file (make a parsor)

I have a file containing a set of entities (STEP file), I want to read it line by line and identify each entity with its attribute, This is an example:

#502=TOLERANCED_LENGTH_MEASURE (30, #326);

#502 is the identifier of the entity

TOLERANCED_LENGTH_MEASURE: the name

30: is an attribute (integer)

#326 is another attribute (which is an identifier of another entity)

Is there any function that allows me to read this file line by line and identify the attribute?

[Rik]

What have you tried already? I assume textscan would be a good place to start looking.