Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression

/
/

Test String

Code Generator

Generated Code

use strict; my $str = 'I’m Kien. I write English is not very well ,i have a issue .. I have a game project .It’s same brickout game project on the internet.I want to display two words, each word on each line.They are joined by the bricks block. Inside ,top line is first name align left,bottom line is lastname align right.They are inputed from textbox(as image) [enter image description here][1] Beside each second the screen display option the number of brick (as a variable, Example 5 bricks per second)until the two words appear complete. I displayed a letter of the alphabet which is created from the matrix(0,1).But I don’t know how to join them into one word . May you help me. you can edit this project below,make same demo, or give me a suggestion about algorithm or keywords on the internet. Thanks a lot Below the project by corona sdk. http://www.mediafire.com/download/1t89ftkbznkn184/Breakout2.rar [1]: http://i.stack.imgur.com/Hl5Ga.png if you not want to download ,you can view 2 files below Bricks.lua local Bricks = display.newGroup() -- static object local Events = require("Events") local Levels = require("Levels") local sound = require("Sound") local physics = require("physics") local Sprites = require("Sprites") local Func = require("Func") local brickSpriteData = { { name = "brick", frames = {Sprites.brick} }, { name = "brick2", frames = {Sprites.brick2} }, { name = "brick3", frames = {Sprites.brick3} }, } -- animation table local brickAnimations = {} Sprites:CreateAnimationTable { spriteData = brickSpriteData, animationTable = brickAnimations } -- get size from temp object for later use local tempBrick = display.newImage(\'red_apple_20.png\',300,500) --local tempBrick = display.newImage(\'cheryGreen2.png\',300,500) local brickSize = { width = tempBrick.width, height = tempBrick.height } --tempBrick:removeSelf( ) ---------------- -- Rubble -- needs to be moved to its own file ---------------- local rubbleSpriteData = { { name = "rubble1", frames = {Sprites.rubble1} }, { name = "rubble2", frames = {Sprites.rubble2} }, { name = "rubble3", frames = {Sprites.rubble3} }, { name = "rubble4", frames = {Sprites.rubble4} }, { name = "rubble5", frames = {Sprites.rubble5} }, } local rubbleAnimations = {} Sprites:CreateAnimationTable { spriteData = rubbleSpriteData, animationTable = rubbleAnimations } local totalBricksBroken = 0 -- used to track when level is complete local totalBricksAtStart = 0 -- contains all brick objects local bricks = {} local function CreateBrick(data) -- random brick sprite local obj = display.newImage(\'red_apple_20.png\') local objGreen = display.newImage(\'cheryGreen2.png\') obj.name = "brick" obj.x = data.x --or display.contentCenterX obj.y = data.y --or 1000 obj.brickType = data.brickType or 1 obj.index = data.index function obj:Break() totalBricksBroken = totalBricksBroken + 1 bricks[self.index] = nil obj:removeSelf( ) sound.play(sound.breakBrick) end function obj:Update() if(self == nil) then return end if(self.y > display.contentHeight - 20) then obj:Break() end end if(obj.brickType ==1) then physics.addBody( obj, "static", {friction=0.5, bounce=0.5 } ) elseif(obj.brickType == 2) then physics.addBody( objGreen,"static",{friction=0.2, bounce=0.5, density = 1 } ) end return obj end local currentLevel = testLevel -- create level from bricks defined in an object -- this allows for levels to be designed local function CreateBricksFromTable(level) totalBricksAtStart = 0 local activeBricksCount = 0 for yi=1, #level.bricks do for xi=1, #level.bricks[yi] do -- create brick? if(level.bricks[yi][xi] > 0) then local xPos local yPos if(level.align == "center") then --1100-((99*16)*0.5) xPos = display.contentCenterX- ((level.columns * brickSize.width) * 0.5/3) + ((xi-1) * level.xSpace)--display.contentCenterX --xPos = 300 +(xi * level.xSpace) yPos = 100 + (yi * level.ySpace)--100 else xPos = level.xStart + (xi * level.xSpace) yPos = level.yStart + (yi * level.ySpace) end local brickData = { x = xPos, y = yPos, brickType = level.bricks[yi][xi], index = activeBricksCount+1 } bricks[activeBricksCount+1] = CreateBrick(brickData) activeBricksCount = activeBricksCount + 1 end end end totalBricks = activeBricksCount totalBricksAtStart = activeBricksCount end -- create bricks for level --> set from above functions, change function to change brick build type local CreateAllBricks = CreateBricksFromTable -- called by a timer so I can pass arguments to CreateAllBricks local function CreateAllBricksTimerCall() CreateAllBricks(Levels.currentLevel) end -- remove all brick objects from memory local function ClearBricks() for i=1, #bricks do bricks[i] = nil end end -- stuff run on enterFrame event function Bricks:Update() -- update individual bricks if(totalBricksAtStart > 0) then for i=1, totalBricksAtStart do -- brick exists? if(bricks[i]) then bricks[i]:Update() end end end -- is level over? if(totalBricksBroken == totalBricks) then Events.allBricksBroken:Dispatch() end end ---------------- -- Events ---------------- function Bricks:allBricksBroken(event) -- cleanup bricks ClearBricks() local t = timer.performWithDelay( 1000, CreateAllBricksTimerCall) --CreateAllBricks() totalBricksBroken = 0 -- play happy sound for player to enjoy sound.play(sound.win) print("You Win!") end Events.allBricksBroken:AddObject(Bricks) CreateAllBricks(Levels.currentLevel) return Bricks And Levels.lua local Events = require("Events") local Levels = {} local function MakeLevel(data) local level = {} level.xStart = data.xStart or 100 level.yStart = data.yStart or 100 level.xSpace = data.xSpace or 23 level.ySpace = data.ySpace or 23 level.align = data.align or "center" level.columns = data.columns or #data.bricks[1] level.bricks = data.bricks --> required return level end Levels.test4 = MakeLevel { bricks = { {0,2,0,0,2,0,0,2,0}, {0,0,2,0,2,0,2,0,0}, {0,0,0,0,2,0,0,0,0}, {1,1,2,1,1,1,2,1,1}, {0,0,0,0,1,0,0,0,0}, {0,0,0,0,1,0,0,0,0}, {0,0,0,0,1,0,0,0,0}, } } Levels.test5 = MakeLevel { bricks = { {0,0,0,1,0,0,0,0}, {0,0,1,0,1,0,0,0}, {0,0,1,0,1,0,0,0}, {0,1,0,0,0,1,0,0}, {0,1,1,1,1,1,0,0}, {1,0,0,0,0,0,1,0}, {1,0,0,0,0,0,1,0}, {1,0,0,0,0,0,1,0}, {1,0,0,0,0,0,1,0} } } -- Levels.test6 = MakeLevel2 -- { -- bricks = -- { ----A "a" = {{0,0,0,1,0,0,0,0}, -- {0,0,1,0,1,0,0,0}, -- {0,0,1,0,1,0,0,0}, -- {0,1,0,0,0,1,0,0}, -- {0,1,1,1,1,1,0,0}, -- {1,0,0,0,0,0,1,0}, -- {1,0,0,0,0,0,1,0}, -- {1,0,0,0,0,0,1,0}, -- {1,0,0,0,0,0,1,0}}, ----B -- "b" = {{1,1,1,1,0,0,0}, -- {1,0,0,0,1,0,0}, -- {1,0,0,0,1,0,0}, -- {1,0,0,0,1,0,0}, -- {1,1,1,1,0,0,0}, -- {1,0,0,0,1,0,0}, -- {1,0,0,0,0,1,0}, -- {1,0,0,0,0,1,0}, -- {1,1,1,1,1,0,0}}, --........... --....... --... -- --Z -- "z"= {{1,1,1,1,1,1,1,0}, -- {0,0,0,0,0,1,0,0}, -- {0,0,0,0,1,0,0,0}, -- {0,0,0,0,1,0,0,0}, -- {0,0,0,1,0,0,0,0}, -- {0,0,1,0,0,0,0,0}, -- {0,0,1,0,0,0,0,0}, -- {0,1,0,0,0,0,0,0}, -- {1,1,1,1,1,1,1,0}} -- } -- } -- stores all levels in ordered table so that one can be selected randomly by index Levels.levels = { --Levels.test4, Levels.test5 -- Levels.test6, } function Levels:GetRandomLevel() return self.levels[math.random(#Levels.levels)] end Levels.notPlayedYet = {} Levels.currentLevel = Levels:GetRandomLevel() -- Events function Levels:allBricksBroken(event) self.currentLevel = Levels:GetRandomLevel() end Events.allBricksBroken:AddObject(Levels) return Levels '; my $regex = qr/\s+$/p; if ( $str =~ /$regex/ ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html