FAQ
Hi everybody,

here is my code:

source is html-code (from GetHtml()). This works fine. But the second
Index()-call gets a smaller value then poss. Why?


func FetchMail(url string) {
  25
  26 mailto := "mailto:"
  27 source := GetHtml(url)
  28
  29 poss := strings.Index(source, mailto)
  30 pose := strings.Index(source[poss + len(mailto):], "\"")
  31
  32 fmt.Println(poss, " ", pose )
  33 //s := source[poss + len(mailto):]
  34
  35
  36 //FetchMail(url)
  37 }

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  • Ian Lance Taylor at Mar 27, 2016 at 8:31 pm

    On Sat, Mar 26, 2016 at 11:12 AM, Thomas Kaufmann wrote:
    here is my code:

    source is html-code (from GetHtml()). This works fine. But the second
    Index()-call gets a smaller value then poss. Why?


    func FetchMail(url string) {
    25
    26 mailto := "mailto:"
    27 source := GetHtml(url)
    28
    29 poss := strings.Index(source, mailto)
    30 pose := strings.Index(source[poss + len(mailto):], "\"")
    31
    32 fmt.Println(poss, " ", pose )
    33 //s := source[poss + len(mailto):]
    34
    35
    36 //FetchMail(url)
    37 }
    Indexing into source[poss + len(mailto):] gives you an index into that
    substring. That is, if character source[poss + len(mailto)] == `"`,
    then the result of the `strings.Index` call will be `0`. If you want
    to use that result as an index into the original string, you need to
    add poss + len(mailto) yourself.

    Ian

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