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Using javascript, I need to parse the Content-Type text/html portion of an email message and extract just the HTML part. Here's an example of the part of the mail source in question: 

------=_Part_1504541_510475628.1327512846983
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit


<html ... a bunch of html ...

/html>

I want to extract everything between (and including) the <html> tags after text/html. How do I do this?

NOTE: I'm OK with a hacky regex. I don't expect this to be bulletproof.

Using javascript, I need to parse the Content-Type text/html portion of an email message and extract just the HTML part. Here's an example of the part of the mail source in question: 

------=_Part_1504541_510475628.1327512846983
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 7bit


<html ... a bunch of html ...

/html>

I want to extract everything between (and including) the <html> tags after text/html. How do I do this?

NOTE: I'm OK with a hacky regex. I don't expect this to be bulletproof.

  • javascript
  • regex
  • email
  • mime
Share Improve this question asked Jul 3, 2012 at 20:25 Ben McCormackBen McCormack 33.2k49 gold badges154 silver badges225 bronze badges
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3 Answers 3

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Based on RFC/MIME documentation, the encapsulation boundary is defined as a line consisting entirely of two hyphen characters ("-", decimal code 45) followed by the boundary parameter value from the Content-Type header field.

Note: In JavaScript there is indeed no /s modifier to make the dot . match all characters, including line breaks. To match absolutely any character, you can use character class that contains a shorthand class and its negated version, such as [\s\S].

Regex:

\n--[^\n\r]*\r?\nContent-Type: text\/html[\s\S]*?\r?\n\r?\n([\s\S]*?)\n\r?\n--

JavaScript:

matches = /\n--[^\n\r]*\r?\nContent-Type: text\/html[\s\S]*?\r?\n\r?\n([\s\S]*?)\n\r?\n--/gim.exec(mail);

The answer by Ωmega is close but you can't be sure that the boundary contains the - character.

You first need to look within the headers. The headers and body of the actual email content will be separated by \r\n\r\n. You should see a header something like 

Content-Type: multipart/alternative;
    boundary="------=_Part_1504541_510475628.1327512846983"

This boundary is what you can then use to find the actual divider. You can then construct a regexp just like Ωmega's but substitute in this divider.

The only thing to be aware of is that the last boundary will have -- at the end in addition to the normal boundary content.

var html = source.toString().substr(source.toString().indexOf("\n\n")).trim();

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