exl questions

• Lookaround lookbefore regex for R
• sqlite or mysql for large datasets
• regex lookarounds, combining lookahead and lookbehind
• Limiting the time that a function processes in an R for loop
• subsetting in data.table
• Fastest way to subset - data.table vs. MySQL
• How do you create a progress bar when using the "foreach()" function in R?

exl answers