package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(?=.*\$val)(\$val|[-+*\/%|&=<> \d])+$`)
var str = `For example:
$val > 100 && $val % 2 === 0
$val + 2 === 0
$val - 2 === 0
$val * 2 === 0
$val / 2 === 0
$val | 2 === 0
$val & 2 === 0
$val < 2 === 0
$val > 2 === 0
$val = 2 === 0
should be accepted, but
10 > 100 && 20 === 30
not (due to absense of $val variable)`
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/