// Split URL into protocol, domain, port and URI
Pattern pattern = Pattern.compile("(https?://)([^:^/]*)(:\\d*)?(.*)?");
Matcher matcher = pattern.matcher(url);

matcher.find();

String protocol = matcher.group(1);            
String domain   = matcher.group(2);
String port     = matcher.group(3);
String uri      = matcher.group(4);

This snippet lists all text links:

data = File.read('the_link_collection.txt')

links = data.scan /href="([^"]*)[^>]*>([^<]*)<\/a>/im

links.each do |link|
  puts "#{link[1].chomp} = #{link[0]}"
end

# extract xxx
text = "{{xxx}}"
if text[/\{\{(.*)?\}\}/]
  xxx = $1
end

# extract all headers from a raw Wikipedia article
# example:
# ==Banks==
# ===Fraud===
# ===Corruption===
# \1 = back reference
headers = text.scan(/^(={1,5})(.+?)\1$/m).inject([]) do |result, m|
  header = OpenStruct.new(:depth => m[0].length, :title => m[1])
  result << header
  print ("    "*header.depth) + header.title + "\n"
  result
end

First download http://sed.sourceforge.net/grabbag/scripts/list_urls.sed.

Make the script executable with chmod:

chmod +x list_urls.sed

Now pipe the HTML to the script:

cat your.html | list_urls.sed

The output will be all URLs it finds...

More Sed scripts and documentation can be found here

This example will find all code tags and pass the lang attribute's value and the code block's content to the block:

output = r.gsub(/<code[\.|\:]([\w\-]+)>(.*?)<\/code[\.|\:]?\1?>/m) do
       lang, text = $1, $2
       html = "<notextile>" + text +  "</notextile>"
end.to_html

The block's return value will replace the found tag.

Install RegexKitLite

First download RegexKitLite.

Configure your project

Double-click the project target under Targets in the Groups & Files sidebar.

Under the Linking header add -licucore to the Other Linker Flags setting.

Setup documentation

In the Xcode menu, open Xcode->Preferences->Documentation. Then click the Add Publisher button.

Add this URL: feed://regexkit.sourceforge.net/RegexKitLiteDocSets.atom

Using RegexKitLite

This will extract the integer that is embedded in a td tag:

NSString *regex = @"<td id\"amount\">(\\d+)</td>";
NSString *body = [[[NSString alloc] initWithData:html encoding: NSASCIIStringEncoding] autorelease];
NSString *amount = [body stringByMatching:regex capture:1];

if ([amount isEqual:@""] == NO) {
    NSLog(@"Amount is %@", amount);
} else {
    NSLog(@"Amount was not found.");
}

Gemfile:

group :test do  
  gem 'jnunemaker-matchy'
end

test_helper.rb:

class ActiveSupport::TestCase
  custom_matcher :match do |receiver, matcher, args|
    regex = args[0]
    matcher.positive_failure_message = "Expected #{receiver} to match #{regex}"
    matcher.negative_failure_message = "Expected #{receiver} not to match #{regex}"
    receiver.match(regex) != nil
  end
end

Your test:

current_path.should match(/\/admin\/companies\/.+/)