Regex

Regex

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Contents

• Introduction
• Character Class
• Repetitions
• Grouping and Capturing
• Backreferences
• Assertions
• Applications

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Introduction

Problem	Java	Javascript	Python
Matching_Anything_But_a_Newline	Solution	Solution	Solution
Matching_Digits_Non_Digits_Characters	Solution	Solution	Solution
Matching_Specific_String	Solution	Solution	Solution
Matching_Start_End	Solution	Solution	Solution
Matching_Whitespace_Non_Whitespace_Character	Solution	Solution	Solution
Matching_Word_Non_Word_Character	Solution	Solution	Solution

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Character Class

Problem	Java	Javascript	Python
Excluding_Specific_Characters	Solution	Solution	Solution
Matching_Character_Ranges	Solution	Solution	Solution
Matching_Specific_Characters	Solution	Solution	Solution

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Repetitions

Problem	Java	Javascript	Python
Matching_Ending_Items	Solution	Solution	Solution
Matching_One_Or_More_Repetitions	Solution	Solution	Solution
Matching_X_Repetitions	Solution	Solution	Solution
Matching_X_Y_Repetitions	Solution	Solution	Solution
Matching_Zero_Or_More_Repetitions	Solution	Solution	Solution

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Grouping and Capturing

Problem	Java	Javascript	Python
Alternative_Matching	Solution	Solution	Solution
Capturing_Non_Capturing_Groups	Solution	Solution	Solution
Matching_Word_Boundaries	Solution	Solution	Solution

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Backreferences

Problem	Java	Javascript	Python
Backreferences_To_Failed_Groups	Solution	N/A	N/A
Branch_Reset_Groups	Solution	N/A	N/A
Forward_References	Solution	N/A	N/A
Matching_Same_Text_Again_Again	Solution	N/A	N/A

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Assertions

Problem	Java	Javascript	Python
Negative_Lookahead	Solution	Solution	Solution
Negative_Lookbehind	Solution	N/A	Solution
Positive_Lookahead	Solution	Solution	Solution
Positive_Lookbehind	Solution	N/A	Solution

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Applications

Problem	Java	Javascript	Python
IP_Address_Validation	Solution	Solution	Solution