How to prevent Numbers and special charecters entry in character field

Hi all,
I have a text field of character type i want to user just enter A-Z or a-z with only space character do not enter 0-9 or or Special Characters, i used format mask like FMAAAAAAAAAAAAAAAA but this not allowing SPACE between characters. Anybody can help!

That's what regular expressions are for:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions130.htm#SQLRF06302
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions129.htm#i1239887
http://docs.oracle.com/cd/B19306_01/server.102/b14200/conditions007.htm#i1048942
When you validate your item you could replace all character you do not want (or check for their existence with regexp_instr).
cheers

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In my database i have a table named birth.DBA prior to me created a column with data type var char,for which data type number must be allocated.Both characters and numbers are entered into that column.now i have to change my data type into number.how can i do this.
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Column A contains labels for the age ranges to be counted.
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When the greyed columns are hidden and the checkbox in the Reorganize pane is checked, the two tables will appear as shown below:
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The earlier formula will give erroneous results as it subtracts only the count directly above it from its count of persons in the age range 0-n.
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B

How to prevent Numbers and special charecters entry in character field

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