How to get a part of a string

[Lina]

Hello,

I have a string data and I want to get a part of it which start for example with "hello" and I want to get 20  characters  after "hello".

(for more details I'm using nrf51DK and a gps module,I recieve all data from gps but I want to get the data that begin with $GPGLL from all the data that I recieve.I didn't know how to to do this,can you please help me and thank you)

How I can do that?

thank you

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[Vidar Berg]

Hello, 

Not sure what the typical packet format is, but you will probably need to implement a parser that can decode packet sent from the GPS module. One approach could be to use strcmp() to check if the string contains the "$GPGLL" keyword, then extract following 20 bytes from the input buffer.