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Filter non-alpha character with grep/regexp

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# 1  
Old 11-06-2013
Filter non-alpha character with grep/regexp
Hi all,
I am trying to filter out those lines that contain a "non-alpha" character.
An example of my input is the following:

Code:
zygnematales    grb
zygocactus    grb
zygocactus_truncatus    plt
zygodactyl_foot    prt
zygoma    prt
zygomatic    prt
zygomatic_arch    prt
zygomatic_bone    prt
zygomatic_process    prt


My desired output is the following:

Code:
zygnematales    grb
zygocactus    grb
zygoma    prt
zygomatic    prt

I have tried the following grep:

Code:
grep '^-' input

but it doesn't seem to work.
Any help?
# 2  
Old 11-06-2013
Try:
Code:
grep -v "[^ a-z]" input

# 3  
Old 11-06-2013
Or use Character Classes:
Code:
grep -v "[[:punct:]]" file

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