# Ruby 1.9 - ArgumentError: incompatible encoding regexp match (US-ASCII regexp with ISO-2022-JP strin

**URL:** <https://www.ruby-forum.com/t/ruby-1-9-argumenterror-incompatible-encoding-regexp-match-us-ascii-regexp-with-iso-2022-jp-strin/133412>\
**Category:** Ruby\
**Created:** [March 31, 2008, 12:28pm UTC](https://www.ruby-forum.com/t/ruby-1-9-argumenterror-incompatible-encoding-regexp-match-us-ascii-regexp-with-iso-2022-jp-strin/133412 "2008-03-31T12:28:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mikel\_L](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/2bfe46/32.png) [@Mikel\_L](https://www.ruby-forum.com/u/Mikel_L)\
**Post date:** [March 31, 2008, 12:28pm UTC](https://www.ruby-forum.com/t/ruby-1-9-argumenterror-incompatible-encoding-regexp-match-us-ascii-regexp-with-iso-2022-jp-strin/133412/1 "2008-03-31T12:28:02Z")

</div>

Hiya all,

I am testing TMail against the latest Ruby (1.9.0 downloaded last  
night), and have come up against this problem:

ArgumentError: incompatible encoding regexp match (US-ASCII regexp  
with ISO-2022-JP string)

Now, I can think of a couple of ways to do this, but has anyone else  
run into this problem and has a nice elegant solution?

I don’t really want to set the regexp to UTF-8 or something and then  
transliterate the match strings as that just isn’t going to scale I  
think when you are talking about emails which can have almost anything  
in them, and making a regexp for every encoding type also isn’t the  
solution.

This only comes up in the 1.9.0 from last night, 1.9.0 from about  
January does not have this issue.

The method that is failing is:

```
def encode_value( str )
  str.gsub(TOKEN_UNSAFE) {|s| '%%%02x' % s[0] }
end

```

And TOKEN\_UNSAFE is defined as:

```
tspecial = %Q|()<>[];:\\,"/?=|
lwsp = %Q| \t\r\n|
control = %Q|\x00-\x1f\x7f-\xff|

TOKEN_UNSAFE = /[#{Regexp.quote tspecial}#{control}#{lwsp}]/n

```

Which already has the ‘n’ switch…

And the failing test is in test\_encode.rb (for anyone with TMail  
installed) and looks like this:

def test\_s\_encode  
SRCS.each\_index do |i|  
assert\_equal crlf(OK[i]),  
TMail::Encoder.encode(NKF.nkf(’-j’, SRCS[i]))  
end  
end

def crlf( str )  
str.gsub(/\n|\r\n|\r/) { “\r\n” }  
end

Which is using the string:

SRCS = [“a cde  
\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212\343\201\202\343\201\204\343\201\206\343\201\210\343\201\212”]

To match against:

OK = [  
“a cde  
=?iso-2022-jp?B?GyRCJCIkJCQmJCgkKiQiJCQkJiQoJCokIiQkJCYkKCQqJCIbKEI=?=\n\t=?iso-2022-jp?B?GyRCJCQkJiQoJCokIiQkJCYkKCQqGyhC?=”,  
#1  
]

Regards

Mikel