Convert string to integer type in Go?
For example strconv.Atoi. Code: package main import ( “fmt” “strconv” ) func main() { s := “123” // string to int i, err := strconv.Atoi(s) if err != nil { // … handle error panic(err) } fmt.Println(s, i) }
string
Escape a string for a sed replace pattern
Warning: This does not consider newlines. For a more in-depth answer, see this SO-question instead. (Thanks, Ed Morton & Niklas Peter) Note that escaping everything is a bad idea. Sed needs many characters to be escaped to get their special meaning. For example, if you escape a digit in the replacement string, it will turn … Read more
Replacing some characters in a string with another character
echo “$string” | tr xyz _ would replace each occurrence of x, y, or z with _, giving A__BC___DEF__LMN in your example. echo “$string” | sed -r ‘s/[xyz]+/_/g’ would replace repeating occurrences of x, y, or z with a single _, giving A_BC_DEF_LMN in your example.
How to search a string in multiple files and return the names of files in Powershell?
This should give the location of the files that contain your pattern: Get-ChildItem -Recurse | Select-String “dummy” -List | Select Path
Replace whole line containing a string using Sed
You can use the change command to replace the entire line, and the -i flag to make the changes in-place. For example, using GNU sed: sed -i ‘/TEXT_TO_BE_REPLACED/c\This line is removed by the admin.’ /tmp/foo
How to test if string exists in file with Bash?
grep -Fxq “$FILENAME” my_list.txt The exit status is 0 (true) if the name was found, 1 (false) if not, so: if grep -Fxq “$FILENAME” my_list.txt then # code if found else # code if not found fi Explanation Here are the relevant sections of the man page for grep: grep [options] PATTERN [FILE…] -F, –fixed-strings … Read more
What is the best way to test for an empty string in Go?
Both styles are used within the Go’s standard libraries. if len(s) > 0 { … } can be found in the strconv package: http://golang.org/src/pkg/strconv/atoi.go if s != “” { … } can be found in the encoding/json package: http://golang.org/src/pkg/encoding/json/encode.go Both are idiomatic and are clear enough. It is more a matter of personal taste and … Read more
Does swift have a trim method on String?
Here’s how you remove all the whitespace from the beginning and end of a String. (Example tested with Swift 2.0.) let myString = ” \t\t Let’s trim all the whitespace \n \t \n ” let trimmedString = myString.stringByTrimmingCharactersInSet( NSCharacterSet.whitespaceAndNewlineCharacterSet() ) // Returns “Let’s trim all the whitespace” (Example tested with Swift 3+.) let myString = … Read more
How to generate a random string of a fixed length in Go?
Paul’s solution provides a simple, general solution. The question asks for the “the fastest and simplest way”. Let’s address the fastest part too. We’ll arrive at our final, fastest code in an iterative manner. Benchmarking each iteration can be found at the end of the answer. All the solutions and the benchmarking code can be … Read more
How do I concatenate strings?
When you concatenate strings, you need to allocate memory to store the result. The easiest to start with is String and &str: fn main() { let mut owned_string: String = “hello “.to_owned(); let borrowed_string: &str = “world”; owned_string.push_str(borrowed_string); println!(“{}”, owned_string); } Here, we have an owned string that we can mutate. This is efficient as … Read more