Golang : Regular Expression for alphanumeric and underscore




Problem :

Need a regular expression that only allows upper, lowercase characters, underscores and numbers for Go.

Solution :

Use this regular expression

"^[a-zA-Z0-9_]*$"

Explanations:

^ : start of string

[ : beginning of character group

a-z : any lowercase letter

A-Z : any uppercase letter

0-9 : any digit

_ : underscore

] : end of character group

* : zero or more of the given characters

$ : end of string

Go source code :

 package main

 import "fmt"
 import "regexp"

 func main() {

  a := "testing_123"

  re := regexp.MustCompile("^[a-zA-Z0-9_]*$")
  fmt.Println(re.MatchString("123"))
  fmt.Println(re.MatchString("abc"))
  fmt.Println(re.MatchString(a))
  fmt.Println(re.MatchString("世界"))

 }

Output :

true

true

true

false

Reference :

http://stackoverflow.com/questions/336210/regular-expression-for-alphanumeric-and-underscores





By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement