http://stackoverflow.com/questions/3512471/non-capturing-group
str = "http://stackoverflow.com/questions/tagged/regex"
str =~ /(http|ftp):\/\/([^\/\r\n]+)(\/[^\r\n]*)?/
puts $1 # => http
# with ?:
Di Wen ifyouseewendy
ifyouseewendy
/ distinct_file_logger.rb
Created
December 10, 2015 14:56
Log to different files based on logging level using Ruby logger
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| require 'logger' | |
| # Examples | |
| # | |
| # logger = DistinctFileLogger.new(STDOUT) | |
| # logger.set_error_path('/Users/wendi/tmp/logger/error.log') | |
| # logger.info "processing: 1/10" | |
| # logger.info "processing: 2/10" | |
| # logger.info "processing: 3/10" |
ifyouseewendy
/ multi_level_page_table.rb
Last active
December 5, 2015 10:47
Code work on Multi-level Page Tables, from Chap20, Operating Systems - Three Easy Pieces
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| class MultiLevelPageTable | |
| PAGE_DIRECTORY_BASE_REGISTER = 108 | |
| # Save all intermedial state in binary string | |
| attr_reader :pages, :virtual_address, | |
| :page_directory_index, :page_table_index, :offset, | |
| :page_directory, :page_directory_entry, :page_frame_number, | |
| :page_table, :page_table_entry, :physical_frame_number, | |
| :physical_address, :value |
ifyouseewendy
/ regexp_reminder.md
Created
July 1, 2015 14:26
ifyouseewendy
/ hash_trick.md
Last active
November 25, 2015 03:46
from http://blog.honeybadger.io/advanced-ruby-hash-techniques/
h = Hash.new { |hash, key| raise ArgumentError.new("No hash key: #{ key }") }
h[:a]=1
h[:a] # 1
h[:x] # raises ArgumentError: No hash key: x
ifyouseewendy
/ js_pass_protect_from_forgery.md
Last active
August 29, 2015 14:23
Make pure js POST request pass the `protect_from_forgery`, without Rails helper.
csrf.js
var csrftk = $("meta[name='csrf-token']").attr("content");
// Ajax set
$(document).ajaxSend(function(e, xhr, options) {
xhr.setRequestHeader("X-CSRF-Token", csrftk);
});
ifyouseewendy
/ stack.rb
Created
June 18, 2015 07:35
A stack implementation from http://codon.com/refactoring-ruby-with-monads
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| # API | |
| # | |
| # + push | |
| # + top | |
| # + pop | |
| # + empty | |
| # + empty? | |
| ArrayStack = Struct.new(:values) do | |
| def push(value) |
ifyouseewendy
/ local_assignment_over_method_sending.md
Created
March 30, 2015 08:29
Remember, local assignment has precedence over method sending.
There is a weird situation I haven't noticed before:
class Counter
attr_accessor :processed, :processed_names
def initialize
@processed = 0
@processed_names = []
end
ifyouseewendy
/ update_git_commit.sh
Created
March 25, 2015 09:20
Update git commit history using git-filter-branch
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| git filter-branch -f --commit-filter ' | |
| if [ "$GIT_COMMITTER_NAME" = "<Old name>" ]; | |
| then | |
| GIT_COMMITTER_NAME="<New name>"; | |
| GIT_COMMITTER_EMAIL="<New email>"; | |
| GIT_AUTHOR_NAME="<New name>"; | |
| GIT_AUTHOR_EMAIL="<New email>"; | |
| else | |
| git commit-tree "$@"; | |
| fi' -- --all |
ifyouseewendy
/ .env
Last active
August 29, 2015 14:16
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| HOST = "" | |
| APP_KEY = "" | |
| APP_SECRET = "" | |
| REQUEST_TOKEN = "" | |
| REQUEST_TOKEN_SECRET = "" | |
| REQUEST_TOKEN_VERIFIER = "" | |
| ACCESS_TOKEN = "" | |
| ACCESS_TOKEN_SECRET = "" |
ifyouseewendy
/ bitwise.md
Created
March 1, 2015 09:07
from Binary and Bitwise Operations in Ruby by CooperPress http://goo.gl/4uQY7f
How to represent base 2, 8, 10, 16 in Integer?