to find numbers in a string

fongthai · #1 (**permalink**) 05-16-2007

I writing my script and got stuck in this function. Can someone help me?
I need to extract out the numbers inside a string.
Ex:
INPUT -> OUTPUT
abcdef123 -> 123
abc123def -> 123
123abcdef -> 123
a123bc45d -> 123 45
abcdefghi -> -1

Thank you!

anbu23 · #2 (**permalink**) 05-16-2007

Code:

sed "s/[^0-9]//g;s/^$/-1/;" filename

ghostdog74 · #3 (**permalink**) 05-16-2007

one way

Code:

echo "salkf4243lsfk" | tr -d '[[:alpha:]]' #or [a-z]

or in bash

Code:

#s="slfk32432sdf"
#echo ${s//[a-zA-Z]/} # or [!0-9]

fongthai · #4 (**permalink**) 05-16-2007

Thanks all!
It works.
But how can we separate each numbers?
Anyway it's fine to me!

anbu23 · #5 (**permalink**) 05-16-2007

Quote:

Originally Posted by fongthai

Thanks all!
It works.
But how can we separate each numbers?
Anyway it's fine to me!

Code:

sed "s/[^0-9]*\([0-9][0-9]*\)[^0-9]*/ \1 /g;s/^[^0-9][^0-9]*$/-1/" filename

ghostdog74 · #6 (**permalink**) 05-16-2007

Code:

awk '{ gsub(/[[:alpha:]]|[[:punct:]]/," ")}1' file

fayya · #7 (**permalink**) 11-22-2007

Hi I have a similar problem, I would like to get a number that falls within a range from a string.

ex. input: "abcd 9034 efg 1234 hi"
output: 9034

I would only want to get the number range from 9000-9999

I've tried to use sed/grep to get what I want for hours but not able to do it, can anyone advice on this? Thanks a lot!!!

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