Find the number after a string

I have a text file containing data blocks. Those blocks are pretty much repetitive. They look like this (added two blocks in bold). There are around 50 blocks like this in the file.

P(22)

Standard Deviation of Fit : 0.00002

Amp 0.0266336611 8.772e-05

nu0 4159.5744620000 1.304e-04

glw 0.0166124171 3.044e-05

nlw 0.0000000000

4159.5695 0.02079 0.02075 0.00004

4159.5699 0.02172 0.02170 0.00002

4159.5704 0.02260 0.02260 0.00000

4159.5709 0.02342 0.02343 -0.00001

4159.5714 0.02416 0.02418 -0.00002

4159.5718 0.02482 0.02484 -0.00002

4159.5723 0.02539 0.02541 -0.00002

4159.5728 0.02586 0.02588 -0.00002

4159.5732 0.02622 0.02624 -0.00001

4159.5737 0.02648 0.02648 -0.00001

4159.5742 0.02661 0.02661 -0.00000

4159.5747 0.02663 0.02662 0.00001

4159.5751 0.02653 0.02652 0.00001

4159.5756 0.02631 0.02629 0.00002

4159.5761 0.02597 0.02595 0.00002

4159.5765 0.02552 0.02550 0.00002

4159.5770 0.02497 0.02495 0.00002

4159.5775 0.02432 0.02430 0.00001

4159.5780 0.02357 0.02357 0.00001

4159.5784 0.02275 0.02275 -0.00001

4159.5789 0.02185 0.02187 -0.00002

4159.5794 0.02089 0.02092 -0.00003

Integrated Cross Section (cm/molecule) : 1.537395e-20

Einstein A Coefficient (1/sec) : 2.097433e-01

R(23)

Standard Deviation of Fit : 0.00000

Amp 0.0237399264 1.270e-05

nu0 4331.0183720000 1.326e-05

glw 0.0166937170 2.409e-06

nlw 0.0000000000

4331.0146 0.02059 0.02058 0.00001

4331.0151 0.02128 0.02127 0.00000

4331.0155 0.02190 0.02190 -0.00000

4331.0160 0.02244 0.02244 -0.00000

4331.0165 0.02289 0.02290 -0.00000

4331.0169 0.02325 0.02326 -0.00000

4331.0174 0.02352 0.02352 -0.00000

4331.0179 0.02368 0.02368 0.00000

4331.0183 0.02374 0.02374 0.00000

4331.0188 0.02370 0.02369 0.00000

4331.0193 0.02354 0.02354 0.00000

4331.0198 0.02329 0.02329 0.00000

4331.0202 0.02294 0.02294 0.00000

4331.0207 0.02249 0.02249 0.00000

4331.0212 0.02196 0.02196 -0.00000

4331.0216 0.02134 0.02134 -0.00000

4331.0221 0.02065 0.02065 -0.00000

Integrated Cross Section (cm/molecule) : 2.026560e-20

Einstein A Coefficient (1/sec) : 2.747273e-01

I need two values from each block (bolded values).

From the first block;

P(22) and the number after the 'Integrated Cross Section (cm/molecule) :' which is 1.537395e-20.

From the second block;

R(23) and the number after the 'Integrated Cross Section (cm/molecule) :'. which is 2.026560e-20.

.....so on for all 50 blocks..

Any help is much appreciated.

Answer 1

[Sean de Wolski]

Something like this:

s = string(fileread(your_file))
val = extractBetween(s, "Einstein A Coefficient (1/sec) :", newline)
double(val)

[Anton Fernando]

works. Thanks.