I have the following expression that I have tested in Rubular and that successfully matches against a snippet of HTML:
Official Website<\/h3>\s*<p><a href="([^"]*)"
However, when I run the expression in Ruby, using the following code, it returns no matches. I've reduced it down to "Official\s*Website" and it matches that, but nothing further.
Are there any additional options I need to set, or anything else that I need to do to configure Ruby/Rails to start tracking Rubular?
matches = sidebar.match(/Official\s*Website<\/h3>\s*<p><a href="([^"]*)"/)
if matches.nil?
puts "no matches"
else
puts "matches"
end
This is the relevant part of the snippet I'm matching against:
<h3>Official Website</h3><p>website.com</p>
your regular expression is correct. rubular should be working the same way your code does.
i tested it against ruby 1.8.7 and 1.9.3
irb(main):006:0> sidebar = ' <h3>Official Website</h3><p>website.com</p>'
=> " <h3>Official Website</h3><p>website.com</p>"
irb(main):007:0> sidebar.match(/Official\s*Website<\/h3>\s*<p><a href="([^"]*)"/)
=> #<MatchData "Official Website</h3><p><a href=\"http://website.com\"" 1:"http://website.com">
-
1.9.3p0 :005 > sidebar = ' <h3>Official Website</h3><p>website.com</p>'
=> " <h3>Official Website</h3><p>website.com</p>"
1.9.3p0 :006 > sidebar.match(/Official\s*Website<\/h3>\s*<p><a href="([^"]*)"/)
=> #<MatchData "Official Website</h3><p><a href=\"http://website.com\"" 1:"http://website.com">
if you want to quickly check why stuff is not working, you should try it in IRB or in your rails console. most of the times it's typo or bad encoding.
Related
In console of rails 4.2.7, I have the following test:
[45] pry(main)> '#$'
=> "\#$"
[46] pry(main)> '##'
=> "\##"
[47] pry(main)> '#!'
=> "#!"
[48] pry(main)> '#ab'
=> "#ab"
It seems rails will only put a "\" before the string when there is an # or $ after #.
The problem leads me to this test is that I have a erb file that render a data attribute with an array of json:
data-xx="<%= [{xx: '#$', yy: 'yy'}.to_json, {zz: 'zzz'}.to_json] %>"
Then in chrome console, it will give the unexpected result as
$("#entry_show_modal_template").data('xx')
"["{\"xx\":\"\#$\",\"yy\":\"yy\"}", "{\"zz\":\"zzz\"}"]"
And when I change xx value from #! or some other string, the result will be ok as an array
$("#entry_show_modal_template").data('xx')
["{"xx":"#!","yy":"yy"}", "{"zz":"zzz"}"]
Does someone know if it is true and why it has such difference?
And it there any way to tackle this problem?
This is not true.
In '#{...}' hash will also be escaped. This is done to prevent recursive/implicit string interpolation.
Look:
$a = 'hello'
"#$a"
#⇒ "hello"
The problem is already solved by ruby for you. Just use the produced string as is and don’t be fooled by the way it is printed out in console.
"\#$".length
#⇒ 2
"\#$" == '#$'
#⇒ true
"\#$"[0]
#⇒ "#"
#mudasobwa's explaination is correct
According to your situation you should try in this way
===> In rails console
json_values = [{xx: '#$', yy: 'yy'}, {zz: 'zzz'}].to_json
===> In chrome console
result = JSON.parse(json_values)
you will get expected array, its just ruby technique to handle string interpolation thing
I have this code
str = #universal_claim_form.errors.full_messages.join
str.gsub('Patient Contact Information: Value', 'Patient phone number') if str =~ /Patient Contact Information/
debugger
str.gsub("\\n", "<br/>")
debugger
flash.now[:error] = "Form has errors and was unable to be submitted.<br/> " << str
the first gsub replaces an unwanted message and the second gsub it meant to replace all the newline characters with html line breaks
at the first debugger line str = "PMP Validation failed. This happens when something you entered does not pass PMP specific validations.\\nPatient phone number: Value must be a 10 digit number"
and at the second debugger the line hasn't changed
what's even more weird is that I did this in irb at the command line and it worked
2.1.1 :001 > s = 'test'
=> "test"
2.1.1 :002 > s
=> "test"
2.1.1 :003 > s += '\ntest'
=> "test\\ntest"
2.1.1 :004 > s.gsub('\\n', '<br/>')
=> "test<br/>test"
2.1.1 :005 >
You can call gsub! to mutate the string you are calling it on (instead of returning a new string).
The reason gsub "works" in irb is because it is outputting the result - irb does not do any assignment or mutation (beyond what one enters), e.g.
irb(main):001:0> foo = 4
=> 4
irb(main):002:0> foo + 6
=> 10
foo is getting assigned 4 so it outputs the result of that assignment, likewise with foo + 6 it outputs the result but the value of foo is unchanged.
When you call gsub it returns a new string with the substitution(s), this is why you feel it "works" in irb (this is no different then it printing "4" above).
I'm following a tutorial on regular expressions in ruby, but a method called regex that seems not working
Tutorial
re = /(\w*)\s(\w*),\s?([\w\s]*)/
match1 = str1.match re
match2 = str2.match re
match1.regex # => wsw,s[ws] (this is IRB's unique way of showing regular expressions; it will still work normally)
My console
The regex method the method throws an error
1.9.3-p547 :033 > re = /(\w*)\s(\w*),\s?([\w\s]*)/
=> /(\w*)\s(\w*),\s?([\w\s]*)/
1.9.3-p547 :034 > match1 = str1.match re
=> #<MatchData "Joe Schmo, Plumber" 1:"Joe" 2:"Schmo" 3:"Plumber">
1.9.3-p547 :035 > match2 = str2.match re
=> #<MatchData "Stephen Harper, Prime Minister" 1:"Stephen" 2:"Harper" 3:"Prime Minister">
1.9.3-p547 :036 > match1.regex
NoMethodError: undefined method `regex' for #<MatchData "Joe Schmo, Plumber" 1:"Joe" 2:"Schmo" 3:"Plumber">
from (irb):36
from /home/fernando/.rvm/rubies/ruby-1.9.3-p547/bin/irb:12:in `<main>'
1.9.3-p547 :037 >
I think it should be
match1.regexp
with a final 'p'
I am using Rails 4.0.0 with Ruby 2.0.0 p247. I am writing an URL regexp matcher but I have no idea why it does not work:
2.0.0-p247 :033 > REGEXP = %r{\Ahttps:\/\/#{ Rails.configuration.aws[:bucket] }\.s3(-#{Rails.configuration.aws[:region]}|)\.amazonaws\.com\/(?<path>uploads\/.+\/(?<filename>.+))\?.+\z}.freeze
=> /\Ahttps:\/\/test-gem\.s3(-eu-west-1|)\.amazonaws\.com\/(?<path>uploads\/.+\/(?<filename>.+))\?.+\z/
2.0.0-p247 :034 > url = "https://test-gem.s3.amazonaws.com/uploads/2alrg16mvx6r-29590d114fb3257846c1a03330418da9/3031674-poster-p-1-for-25.jpg"
=> "https://test-gem.s3.amazonaws.com/uploads/2alrg16mvx6r-29590d114fb3257846c1a03330418da9/3031674-poster-p-1-for-25.jpg"
2.0.0-p247 :035 > REGEXP.match(url)
=> nil
But when I try to debug in things like Rubular, it does work. Any idea? Thanks!
Remove \?.+ in the end if your regexp
Might be a bug with Ruby 2.0.0. I'm using 2.1.3 and it works like you'd expect.
> r = /\Ahttps:\/\/test-gem\.s3(\A-eu-west-1\z|)\.amazonaws\.com\/(?<path>uploads\/.+\/(?<filename>.+))\z/
=> /\Ahttps:\/\/test-gem\.s3(\A-eu-west-1\z|)\.amazonaws\.com\/(?<path>uploads\/.+\/(?<filename>.+))\z/
> r.match("https://test-gem.s3.amazonaws.com/uploads/2alrg16mvx6r-29590d114fb3257846c1a03330418da9/3031674-poster-p-1-for-25.jpg")
=> #<MatchData
"https://test-gem.s3.amazonaws.com/uploads/2alrg16mvx6r-29590d114fb3257846c1a03330418da9/3031674-poster-p-1-for-25.jpg"
path:"uploads/2alrg16mvx6r-29590d114fb3257846c1a03330418da9/3031674-poster-p-1-for-25.jpg"
filename:"3031674-poster-p-1-for-25.jpg">
In rails console when I want to add a column to my table with below command
2.1.1 :001 >post = Post.new( :title => "first post", :job => "first job”)
it gives me
2.1.1 :002">
2.1.1 :003">
2.1.1 :004">
and doing nothing! I don't know what is problem here?
You didn't close quotes.
"first job”
Note that ” are not the same as " Console is waiting for you to close all the brackets and quotes before it executes the command.
if you copied and pasted the code the problem is with the last double-quotes
'”'.ord #=> 8221
'"'.ord #=> 34
'”' == '"' #=> false