multiple-matches

I'm trying to match experience levels for various positions based on 1. Degree 2. Years of Experience. The pattern is fairly simple (example: "BS/5" would be a bachelors of science with 5 years of experience. I also have entries that follow this scheme but have multiple degrees and experience levels in the same string (example: "BS/5-MS/2") that are considered equivalent. I've got a basic function that will match and find the substring pattern but it never returns more than one match even though I've set the .Global property to true for the regexp object. Any ideas? Code below: On Error Resume

How can I find all substrings that match a regex in Java? (Similar to Regex.Matches in .Net) Create a Matcher and use find() to position it on the next match. Here is a code sample: int countMatches(Pattern pattern, String str) { int matches = 0; Matcher matcher = pattern.matcher(str); while (matcher.find()) matches++; return matches; } 来源： https://stackoverflow.com/questions/1266943/how-to-get-multiple-regex-matches-in-java

I want to select multiple columns based on their names with a regex expression. I am trying to do it with the piping syntax of the dplyr package. I checked the other topics, but only found answers about a single string. With base R: library(dplyr) mtcars[grepl('m|ar', names(mtcars))] ### mpg am gear carb ### Mazda RX4 21.0 1 4 4 ### Mazda RX4 Wag 21.0 1 4 4 However it doesn't work with the select/contains way: mtcars %>% select(contains('m|ar')) ### data frame with 0 columns and 32 rows What's wrong? You can use matches mtcars %>% select(matches('m|ar')) %>% head(2) # mpg am gear carb #Mazda