package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)\{((?>[^{}]+|{(?1)})*)\}`)
var str = `\int_{1}^{2}\frac{x}{x/2}+{\frac{\sqrt{81}}{7x}}^7
\int x
\int_{19{} cz }^{2}{\frac{x}{x/2}+7}+7
(\int_{1}^{2}\frac{x}{x/2})/2`
var substitution = "$1"
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/