Regular Expressions Cheat Sheet by DaveChild A quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started. For Ruby v1.8.x $ gem install ruby-debug-ide $ gem install ruby-debug-base. For Ruby v1.9.x $ gem install ruby-debug-ide $ gem install ruby-debug-base19x. For Ruby v2.x $ gem install ruby-debug-ide $ gem install debase. Trying out the debugger. Step 1: Create a file sample.rb with some code. 2.times do puts “hello”.upcase end. A type modifier can appear after the%: q for strings, r for regexp, i symbol array, w stringarray,xforshellcommand,andssymbol. Besidesx, s,therestcanbecapitalised. In Ruby, just as methods can be overriden and advised,classesare open: They can be. Ruby Reference Sheet. So you want to check if a particular string is a valid email address or not in Ruby. You want to start by creating a constant variable that stores your regular expression. There are countless resources with Regex cheat sheets that you can incorporate for matchers.
Ruby Regex Cheat Sheet Printable
Ruby Regex Cheat Sheet Pdf
CharacterLegendExampleSample Match
d | Most engines: one digit
from 0 to 9 | file_dd | file_25
d | .NET, Python 3: one Unicode digit in any script | file_dd | file_9੩
w | Most engines: 'word character': ASCII letter, digit or underscore | w-www | A-b_1
w | .Python 3: 'word character': Unicode letter, ideogram, digit, or underscore | w-www | 字-ま_۳
w | .NET: 'word character': Unicode letter, ideogram, digit, or connector | w-www | 字-ま‿۳
s | Most engines: 'whitespace character': space, tab, newline, carriage return, vertical tab | asbsc | a b
c
s | .NET, Python 3, JavaScript: 'whitespace character': any Unicode separator | asbsc | a b
c
D | One character that is not a digit as defined by your engine's d | DDD | ABC
W | One character that is not a word character as defined by your engine's w | WWWWW | *-+=)
S | One character that is not a whitespace character as defined by your engine's s | SSSS | Yoyo