Re: Problem: extracting substring

[maybee]

Thank you, Bob.

Both work great for me.



Bob Proulx wrote:
> 
> maybee wrote:
>> 
>> I have a string  mq001234ms00567_b3.45_323x7,
>> and I want to subtract the numbers from it, that is,
>> I will get 
>> mq=001234
>> ms=00567
>> b=3.45
>> 
>> These number may have various digits.
>> Any neat way doing this under bash?
> 
> I myself would use 'sed' (because I always have):
> 
>   x=mq001234ms00567_b3.45_323x7
> 
>   mq=$(echo "$x" | sed 's/mq\([[:digit:]]*\).*/\1/')
>   echo "$mq"
>   001234
> 
>   ms=$(echo "$x" | sed 's/.*ms\([[:digit:]]*\).*/\1/')
>   echo "$ms"
>   00567
> 
>   b=$(echo "$x" | sed 's/.*_b\([0-9][0-9]*[.][0-9][0-9]*\).*/\1/')
>   echo "$b"
>   3.45
> 
> But it certainly seems reasonable to use the bash parameter expansion
> methods to do something similar.
> 
>   $ echo ${x%%ms*}
>   mq001234
> 
> But my brain doesn't think that way and so I didn't work up a full
> procedure.
> 
> Bob
> 
> 
> 
> 

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