[erlang-questions] Of regexes and REs, and other irritating things...

Per Hedeland <>
Mon Aug 11 09:03:29 CEST 2014


>Mike Oxford <> wrote:
>
>I need to so some input sanitizing for use against MySQL.

Well, you're not saying exactly what you want to achieve, so it's a bit
difficult to comment, but...

>122> re:replace("This isn't much of a \"test string\"; it'll have to do
>though.",   "([';\"])",  <<92,"\\\\1">>,    [global, {return, binary}]).

... it seems that you want to \-escape all occurences of ', ;, and "...

><<"This isn\\'t much of a \\\"test string\\\"\\; it\\'ll have to do
>though.">>

... and it seems that you succeeded.

>So I went with a replacement of <92,"\\\\1"> thinking I'd get around it,

You can use "\\\\\\1" instead with same result - not saying it is any
more readable:-), but avoids throwing in an ascii code and is actually a
little shorter...

>but it didn't work either.  Closest I got was "\\;" in the string which is
>still incorrect.

I believe you are just confused by the "string rendering" - backslashes
must also be backslash-escaped in the "string form", there is only one
of them actually in there. Try this:

1> [97,92,59,98].
"a\\;b"

--Per Hedeland



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