Regular Expressions

Source: xkcd

Resources for learning regular expressions -

1. Wikipedia
2. Beginner's Guide - Blog Post This is the best post to learn regular expressions fast with all the basics.
3. Regular Expression info Advanced in-depth tutorial about all regular expression topics

Online Practice tools -

1. Regex101 (I personally prefer this, as this also explains and has all different regex engines.)
2. Regexr

Different Regex Engines -

1. C#
2. Ruby
3. PHP
4. Perl (PCRE - Perl Compatible Regular Expressions)
5. Java
6. JavaScript
7. Python

Advanced Topics -

• Conditionals
• Atomic Groups
• Look Arounds [IMP]
• Named Capture
• Inline modifiers
• Subroutines
• Recursive expressions
• Predefined subroutines
• Branch reset
• Inline comments

Cheat Sheets -

1. https://dzone.com/refcardz/regular-expressions
2. http://www.rexegg.com/regex-quickstart.html

Online Challenges -

Link	Complexity
https://www.hackerrank.com/domains/regex/re-introduction	Beginner - Intermediate
https://regex.sketchengine.co.uk/	Beginner - Advanced
https://regexcrossword.com/	Beginner - Advanced
https://regexone.com/	Beginner
http://play.inginf.units.it/#/	Advanced

Regex Crossword

Solution to RegexCrossword

My Profile - Regex Crossword Profile

Rank - 45 Out Of 47450

Number of Puzzles Solved - 392

Top Player Stats and Ranking

Underscore '_' represents SPACE

1. Tutorial

Level	Name	Solution
1	The OR symbol	A
2	A Range of characters	B
3	Characters NOT to include	C
4	Zero or more	A A
5	Zero or one	A B
6	One or more	A A
7	Backreference	A A
8	Specific amount	A A
9	Space	' '

2. Beginner

Level	Name	Solution
1	Beatles	HELP
2	Naughty	BOBE
3	Ghost	OOOO
4	Symbolism	**//
5	Airstrip One	1984

3. Intermediate

Level	Name	Solution
1	Always remember	ATO WEL
2	Johnny	WA LK ER
3	Earth	FOR TY- TWO
4	Encyclopedia	DON TPA NIC
5	Technology	TURN OFFA NDON

4. Experienced

Level	Name	Solution
1	Royal Dinner	FOODF ITFOR AKING
2	Regular Workout	REGUL AREXP RESSI ONOFT HEDAY
3	We apologise for the inconvenience	ANSWE RTHEG REATQ UESTI ONNOW
4	Questionable	?!!!? !?!?! !!?!! !?!?! ?!!!?
5	Hamlet	TOBEO RNOTT OBEAR EGULA RREGX

5. Palindromeda

Level	Name	Solution
1	Ten o'clock	NET EWE TEN
2	Third	GEL EYE LEG
3	Horn	RATS ABUT TUBA STAR
4	Open the lid	TRAP RAJA AJAR PART
5	Time Walker	STEP TIME EMIT PETS

6. Double Cross

Level	Name	Solution
1	Telekinesis	ET
2	GMC Vandura	A-T EAM
3	Bat Man	NOS FER ATU
4	Big Mac	PUL P_F ICT ION
5	The Lektor Device	FRO M_R USS IA_ WIT H_L OVE

7. Cities

Level	Name	Solution
1	Pisco Sour	LI MA
2	Roman Latin	LON DIN IUM
3	Big and hot	NEW_ YORK
4	Alpha World City	KUAL A_LUM PUR
5	Home	_CO PEN HAG EN_

8. Volapuk

Level	Name	Solution
1	Bal	GPO ZKS
2	Tel	M0Y P.H P\2
3	Kil	M?BO SNUO ?PYO
4	Fol	70MW /DBE 1_SP :XNA
5	Lul	TRAN7 24L?_ AM5$L -WE3O DEFF?

9. Hamlet

Level	Name	Solution
1	The Ghost	REVENGE _HIS_FO UL_AND_ MOST_UN NATURAL _MURDER
2	Hamlet and Ophelia	TO_BE,_ OR_NOT_ TO_BE,_ THAT_IS _THE_QU ESTION_
3	The Play	HE_POIS ONS_HIM _I'_THE _GARDEN
4	Laertes	TOO_MUC H_OF_WA TER_HAS T_THOU, _POOR_O PHELIA!
5	Memento	ALAS,_ POOR_Y ORICK! _..._A _FELLO W_OF_I NFINIT E_JEST
6	The End	NOW_C RACKS _A_NO BLE_H EART. _GOOD _NIGH T,_SW EET_P RINCE

10. Hexagonal

Level	Name	Solution
1	Buzz buzz	H IV E
2	Garden	FL RO! WE
3	Pollen	SES A"ED .B.B_ I_D" R.N
4	Stationary	S_E_ ASVTL "OET"L B_S=___ YSOEIY VTTEM FR_A
5	Winnie	'NIB THOSE TFA__W TH_ISNG BEEEEEEE O_RR_HO _STE__ KING_ VNR.

Player Puzzles

Sr.No.	Name	Created By	Solution
1	Binary	#6450	11001 11100 01010 01111 00001
2	Letter	#2009	TH_IS I_S_L _ETT_ _____ _ERA_
3	Morse	#2009	.-. . --. . -..- -.-. .-. -.-. .-. --- ... ... .-- --- .-. -.. .. ... -.-. --- --- .-.. (REGEXCRCROSSWORDISCOOL)
4	Regex Picross	#3162
5	Unique Puzzle	#21964	8259173064!
6	Checkmate, Atheists	#14171

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