python - Reading text file for specfic keyword included inside brackets '{' -

i read text file below. has geometry names --> " hvac,outlet,inlet,lamelle,duct , wall"

in case 6, may vary depending on different simulation of cfd process.

i extract geometry names , corresponding 'type'. in case geometry , types " hvac,outlet,inlet,lamelle,duct , wall" , "wall , patch" respectively.

should use parse using xml or search string after '{\n' , '}\n' keyword .

geometry {     hvac     {         type            wall;         ingroups        1(wall);         nfaces          904403;         startface       38432281;     }     outlet     {         type            patch;         nfaces          8228;         startface       39336684;     }     inlet     {         type            patch;         nfaces          347;         startface       39344912;     }     lamelle     {         type            wall;         ingroups        1(wall);         nfaces          204538;         startface       39345259;     }     duct     {         type            wall;         ingroups        1(wall);         nfaces          535136;         startface       39549797;     }     wall     {         type            wall;         ingroups        1(wall);         nfaces          118659;         startface       40084933;     } } 

the answer depends on whether want support whole general openfoam's dictionary format, or not.

if need support format similar have shown in question, simple regex \b(\w+)\s+{\s+type\s+(\w+); do: https://regex101.com/r/yv8tk2/1 . can option if control how dictionary created, though in case might simpler obtain needed information directly code creates dictionary.

however, openfoam's format dictionaries more rich example. can allow #include directives, can allow regexs keys, can allow referencing of other keys using $ syntax, can allow comments, c++ code snippets , many more (i not pretend know well). typical example can 2 dictionaries:

---- file data.incl:  basetype wall;  ---- file data  #inputmode merge; #include "data.incl"  geometry {     /* foo {             type wrongtype; // commented entry     } */      foo {         type $basetype; // expand wall         ...     }     "(bar|buz)" {  // match bar , buz          ...     }  } 

if need parse such dictionary, recommend code in c++ , use standard openfoam classes, allow in couple of lines of code.