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# 1  
Old 06-12-2008
Bug alphabetical check
echo $TEMP|grep "[A-Z][a-z]"

I want to check TEMP is alphabetic or not in both the cases.but in above script i am getting 1($?) if TEMP is in pure lower case or pure upper case.i want to get 0($?) when TEMP would be alphabetic in either cases.pleaaaase help me out.....
# 2  
Old 06-12-2008
try this
Quote:
Originally Posted by arghya_owen
echo $TEMP|grep "[A-Z][a-z]"

I want to check TEMP is alphabetic or not in both the cases.but in above script i am getting 1($?) if TEMP is in pure lower case or pure upper case.i want to get 0($?) when TEMP would be alphabetic in either cases.pleaaaase help me out.....
Code:
echo $TEMP | grep "^[A-Z|a-z]*$"

# 3  
Old 06-12-2008
Quote:
Originally Posted by ynir
Code:
echo $TEMP | grep "^[A-Z|a-z]*$"

The use of the quantifier * is inappropriate as this pattern will match an empty string. Also, if you include the pipe in a character class like you do, that pattern will also match the character | in ab|kjlza. Better use this pattern:

^[A-Za-z]+$
# 4  
Old 06-13-2008
This will also help you,

Code:
echo $TEMP | grep ^[[:alpha:]][[:alpha:]]*$

Regards,
Chella
# 5  
Old 06-13-2008
Useless use of *
Quote:
Originally Posted by chella
This will also help you,

Code:
echo $TEMP | grep ^[[:alpha:]][[:alpha:]]*$

Regards,
Chella
Again, the second class [[:alpha:]] with its quantifier * (0 occurrence or more) is useless because if * means 0, the whole pattern will match one single alpha character from the first character class. If * means more, the whole pattern [[:alpha:]][[:alpha:]]* will match two alpha character or more. This could simply be written [[:alpha:]]+
Smilie
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