Overview net/http package of golang provides the status code constants which could be used to return different status codes- https://golang.org/src/net/http/status.go The same can also be used to return the 400 (Bad Request)…
Tag: golang
Golang Regex: Match a floating-point number in Regular Expression
Overview A floating-point number could have below properties It could have a negative and positive sign The integer part could be optional when the decimal part is present The dot and decimal…
Golang Regex: Optional Operator or question mark (?) in regular expression
Overview Question Mark is the optional operator in regex. This means that it optionally matches the preceding character before the question mark Eg. This will match both “abc” and “abcd”. Program Let’s…
Reverse Doubly Linked List in Go (Golang)
Overview A Doubly Linked List can be reversed by below two methods: By swapping previous and next pointers of nodes. By using stack In this tutorial, we will cover the first method…
Golang Regex: Backreferences
Overview Golang regex package regexp uses the re2 engine which doesn’t support backreferences. You can check the same here https://github.com/google/re2/wiki/Syntax It does mention that it doesn’t support backreferences. However, there is another…
Golang Regex: Understanding dot ‘.’ character
Overview Dot ‘.’ character is one of the most commonly used metacharacters in the regular expression. It is used to match any character. It can also match a new line if a…
Golang Regex: Case insensitive regular expression matching in Go (Golang)
Overview The default behavior for regular expression matching in golang is case sensitive. But the default behavior can be changed by adding a set of flags to the beginning of the regular…
Delete a kth node from back in a Singly Linked List in Go (Golang)
Overview Delete a kth node from the back in a Singly Linked List Input linked list: Node to be removed is 3rd from the back, then Output linked list: Program Output Explanation…
Golang Regex: Match prefix or suffix of a string
Overview Golang regex contains two anchor characters that can be used to match the prefix and suffix of a string given a regular expression. These two characters are Caret Character ‘^’ –…
Alternation (OR) of regexes in Go (Golang)
Overview It is similar to OR operation. Join two regexes by using the | operator. If there are two regexes r1 and r2, then alternation is represented as below It will either…