How to process a txt file for parsing with a function in C#

Hello,

I've a txt file like below and i'd like to get some informations from it with a function but need a expert help for parsing.

  139 142    :No. nodes, No. modes:
 part                                            
      new modal                                 =                                                                                 
           refmod                                
                mass                            = 2.000D+03
                nelastq                         = 142
                ielastq (   1)                  = Eigen Mode    7 :        3.895 Hz
                ielastq (   2)                  = Eigen Mode    8 :        8.914 Hz
                ielastq (   3)                  = Eigen Mode    9 :       10.455 Hz
                ielastq (   4)                  = Eigen Mode   10 :       10.633 Hz
                ielastq (   5)                  = Eigen Mode   11 :       14.134 Hz
                ielastq (   6)                  = Eigen Mode   12 :       14.230 Hz
                ielastq (   7)                  = Eigen Mode   13 :       14.839 Hz
                ielastq (   8)                  = Eigen Mode   14 :       15.543 Hz
                ielastq (   9)                  = Eigen Mode   15 :       16.810 Hz
                ielastq (  10)                  = Eigen Mode   16 :       16.921 Hz
                ielastq (  11)                  = Eigen Mode   17 :       17.858 Hz
                ielastq (  12)                  = Eigen Mode   18 :       18.822 Hz
                ielastq (  13)                  = Eigen Mode   19 :       19.006 Hz
                ielastq (  14)                  = Eigen Mode   20 :       19.335 Hz
                ielastq (  15)                  = Eigen Mode   21 :       19.430 Hz
                ielastq (  16)                  = IRM           1 :       59.876 Hz
                ielastq (  17)                  = IRM           2 :       60.495 Hz
                ielastq (  18)                  = IRM           3 :       61.735 Hz
                ielastq (  19)                  = IRM           4 :       64.041 Hz
                ielastq (  20)                  = IRM           5 :       67.065 Hz
                ielastq (  21)                  = IRM           6 :       67.663 Hz
                ielastq (  22)                  = IRM           7 :       69.528 Hz
           end refmod   
	   
			Some Text Data
			.
			.
			.     

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I'd like to get informations from  ielastq (   *id*) rows.

If there's a function like

public static string[] GetIElastiq(int id)
{
// some code here
}

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if i wrote id 10 that function i'd like to get result as [ {Eigen Mode}, {16}, {16.921} ]

It'll found the row:          

   ielastq (  10)                  = Eigen Mode   16 :       16.921 Hz

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and parse for me.

The values always between "refmod" and "end refmod" so Textreader only can focus this region.

Any help would be very great!!

Thank you.