package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(?!(?:From|To|Subject|References):)[^:\n]*:\s*\K[^\n]*`)
var str = `A date
From: One line of text
To: One or more lines
Subject: One or more lines
References: One or more lines
Paragraph 1 Title:
A paragraph
Paragraph 2 Title: Another paragraph
…. Etc`
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/