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String Manipulation

Master essential string processing techniques and patterns that appear frequently in coding interviews.

String parsing & validation​

  • Valid Parentheses: Check if parentheses are balanced
  • Valid Number: Validate if string represents valid number
  • Valid Email: Check email format validation
  • JSON Parsing: Parse structured string data

Anagram problems​

  • Anagram Detection: Check if two strings are anagrams
  • Group Anagrams: Group strings that are anagrams of each other
  • Anagram Substring: Find anagram of pattern in text
  • Anagram Pairs: Count pairs of anagram strings

String matching & searching​

  • Pattern Matching: Find pattern in text string
  • String Search: Locate substring within string
  • Multiple Patterns: Search for multiple patterns simultaneously
  • Case Insensitive: Handle case-insensitive matching

String transformation​

  • String Reversal: Reverse string or parts of string
  • Case Conversion: Convert between uppercase and lowercase
  • Character Replacement: Replace characters in string
  • String Compression: Compress repeated characters

Regular expressions basics​

  • Pattern Matching: Using regex for string validation
  • Character Classes: Matching specific character sets
  • Quantifiers: Matching repeated patterns
  • Groups and Captures: Extracting parts of matched text