[R] Extracting numbers from a character variable of different types

[irene]

Hello,

I have a file which contains a column with age, which is represented in the
two following patterns

1. "007/A" or ''007/a" or ''7 /a" ..... In this case A or a means year and I
would like to extract only the numeric values eg 7 in the above case if this
pattern exits in a line of file.

2. "004/M" or "004/m" where M or m means month ...... for these lines I
would like to first extract the numeric value of Month eg. 4  and then
convert it into a value of years, which would be 0.33 eg 4 divided by 12.

Can anyone help?

Thank you 

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