Golang : How to check if input string is a word?
Problem :
I'm writing a parser and I need to determine if the user input is a word or something else? How to do that?
Solution :
Use the IsWordChar()
function from syntax/regexp
package. For example :
NOTE : This solution is for ASCII-only: the word characters are [A-Za-z0-9_].
package main
import (
"fmt"
"regexp/syntax"
)
func main() {
word1 := []rune("alpha")
word2 := rune('吃') // no need for array if for single rune
word3 := []rune("1234")
word4 := []rune(" $#$^@#$ ")
ok := syntax.IsWordChar(word1[0])
fmt.Printf("%v is a word ? : %v \n", string(word1), ok)
ok = syntax.IsWordChar(word2)
fmt.Printf("%v is a word ? : %v \n", string(word2), ok)
ok = syntax.IsWordChar(word3[0])
fmt.Printf("%v is a word ? : %v \n", string(word3), ok)
ok = syntax.IsWordChar(word4[0])
fmt.Printf("%v is a word ? : %v \n", string(word4), ok)
}
Output :
alpha is a word ? : true
吃 is a word ? : false
1234 is a word ? : true
$#$^@#$ is a word ? : false
Reference :
https://www.socketloop.com/references/golang-regexp-syntax-iswordchar-function-example
See also : Golang : How to tokenize source code with text/scanner package?
By Adam Ng
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