package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(?<!XXY)(?<=Y)\w(?=Y)(?!YYXX)`)
var str = `(?<!XXY)(?<=Y)\w(?=Y)(?!YYXX)
^ ^ ^ ^ ^
| | | | not before YYXX
| | |before Y
| |letter
| followed by Y
not followed by XXY
X0XYXYYX
X(?=Y) match X if before Y
X(?!Y) match X if not before Y
(?<=Y)X match X if followed by Y
(?<!Y)X match X if not followed by Y`
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/