On Dec 7, 2009, at 5:04 PM, Ramya wrote:
Hi there
I have a string like this i want to extract 9831019 from this string
i used
a regular expresion \d+ by which i can only make it to see 7 and
returns.
This type of number(9831019) appears in any part of the string and is
definitely more than 5 digits all the time and i want to give that
as a
condition
UV7C11-F9-E1 MCS#9831019
MCS Lot #9512516"
how do i go abt it
Ramya
Is the double quote actually part of your data or just a typo?
I am not sure that it might matter in the end, but here is one approach:
> x
[1] "UV7C11-F9-E1 MCS#9831019" "MCS Lot #9512516\""
Note that I have the double quote included in the second value, which
is escaped when printed here.
> gsub("^.*#([0-9]*).*$", "\\1", x)
[1] "9831019" "9512516"
This uses gsub() to extract the value within the parens in the regex
using a back reference.
Any characters from the beginning of the line to the '#' are dropped,
as are any characters after the numeric sequence to the end of the line.
See ?gsub for more information.
HTH,
Marc Schwartz
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