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Check out the ruby String class: http://www.ruby-doc.org/core-2.1.1/String.html. Note the start_with?() method and the match() method. You don't need a complex regex, you can use a compound if statement:

查看ruby String类：http：//www.ruby-doc.org/core-2.1.1/String.html。注意start_with？（）方法和match（）方法。您不需要复杂的正则表达式，可以使用复合if语句：

line = "abc attach"

if (not line.start_with?('>')) and line.match("attach")
  puts 'yes'
else 
  puts 'no'
end

--output:--
yes

to get that meaning I could use something ALMOST like ^> attach except i need the negation of ^>, which I'm not sure how to do.

为了得到那个含义，我可以使用像^> attach这样的东西，除了我需要否定^>，我不知道该怎么办。

You can use a character class: [>], which matches '>', and then negate the class: [^>], which matches anything but a '>' character.

您可以使用匹配'>'的字符类：[>]，然后取消类：[^>]，它匹配除“>”字符之外的任何内容。

also know that I can't just have it like that but I need something like (?'attach'),

也知道我不能只是这样，但我需要像（？'attach'），

If you have to use a regex, then think of wording the regex like this:

如果你必须使用正则表达式，那么考虑像这样的正则表达式的措辞：

1) You want to match the start of the string
2) Followed by any character that is not a '>' 
3) Followed by zero or more of any character  (see the regex character . and the modifier *)
4) Followed by the word 'attach'

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Rubular: a Ruby regular expression editor and tester

Rubular：一个Ruby正则表达式编辑器和测试器

http://rubular.com/

http://rubular.com/

This should get you started with regular expressions.

这应该让你开始使用正则表达式。

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If you want to match any non-">" character in a regex, you can use the negation symbol "^" within a custom character class (all characters within a set of square brackets [])

如果要匹配正则表达式中的任何非“>”字符，可以在自定义字符类中使用否定符号“^”（方括号[]中的所有字符）

1.9.3-p448 :038 > one = "> line with"
 => "> line with"
1.9.3-p448 :039 > two = ">attach"
 => ">attach"
1.9.3-p448 :040 > three = "$#@asdfj>dsfkjhattach"
 => "$>dsfkjhattach"
1.9.3-p448 :041 > /^[^>].*attach/.match(one)
 => nil
1.9.3-p448 :042 > /^[^>].*attach/.match(two)
 => nil
1.9.3-p448 :043 > /^[^>].*attach/.match(three)
 => #<MatchData "$>dsfkjhattach">

So, a method that does what you are asking for would be:

因此，满足您要求的方法是：

def matchAttachNoAngleBracket(subject)
  /^[^>].*attach/.match(subject) ? "yes" : "no"
end
1.9.3-p448 :047 > matchAttachNoAngleBracket(one)
 => "no"
1.9.3-p448 :048 > matchAttachNoAngleBracket(two)
 => "no"
1.9.3-p448 :049 > matchAttachNoAngleBracket(three)
 => "yes"