package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?<!\d)\d{3}(?!\d)`)
var str = `a 123 234 b
- Has to match 123 and 234
a 123_234 b
- Has to match 123 and 234
aa123 234 b
- Has to match 123 and 234
a0123 234 b
- Has to match only 234
123a234 b
- Has to match 123 and 234
a 123 234
- Has to match 123 and 234`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/