package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(\d*\.\d*|\d*|x_{\d*}|\(.*?\)+)[\/]+(\(.*?\)|x_{\d*}|\d*\.\d*|\d*)`)
var str = `311/3-31.2/3+x_{3}/4+(3+4)/2+(x_{12}/2+234)/1+9/(3+8)+(5+9/8)/5.6+x_{8}/x_{7}+(3)/m`
var substitution = "\\frac{$1}{$2}"
fmt.Println(re.ReplaceAllString(str, substitution))
}
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/