Regular expression and Date selecting

Question

I have the data with this date format: 01.01.1981 to 31.10.2005. But I have to select just the data from May to September for each year. 01.05 to 30.09 How can I write the script in Rstudio??? I am using windows 8.

Answer 1

I don't know Rstudio, but this is the regular expression that will match those dates:

\d{2}\.0[5-9]\.\d{4}