atreju questions

• Using Perl regex to find and extract matches over multiple lines
• Reorder vector in R according to index vector
• Use Perl idioms $/ and q|| to read text file blockwise
• Using dplyr to group_by and conditionally mutate only with if (without else) statement
• Remove node by ID in jstree when button is clicked
• Get Quantile values from geom_boxplot()
• Fastest way to test two strings for exact match in JavaScript

atreju answers