C++ Boost String Algorithms Library

The Boost String Algorithms Library provides a generic implementation of string-related algorithms which are missing in STL. It is an extension to the algorithms library of STL and it includes trimming, case conversion, predicates and find/replace functions. All of them come in different variants so it is easier to choose the best fit for a particular need. The implementation is not restricted to work with a particular container (like basic_string), rather it is as generic as possible. This generalization is not compromising the performance since algorithms are using container specific features when it means a performance gain.

• Converting a string to uppercase and lowercase. STL has a nice way of converting the character case. Unfortunately, it works only for a single character and we want to convert a string,
  • to_upper() and to_lower() convert the case of characters in a string using a specified locale.
  • to_upper_copy() and to_lower_copy() returns the copy of the converted string.
  Examples:
  Output:

  Actual string: Hello
  Actual string converted to uppercase: HELLO
  Actual string converted to lowercase: hello
  Converted Uppercase string: HELLO
  Converted Lowercase string: hello
  

• To remove characters from a string Boost.StringAlgorithms provides several functions you can use to delete individual characters from a string.
  • erase_first_copy() will remove the first occurrence in the source string.
  • erase_nth_copy() will remove the nth occurrence in the source string.
  • erase_all_copy() will remove all occurrences of a particular character from a string.
  • To shorten a string by a specific number of characters on either end, use the functions erase_head_copy() and erase_tail_copy().
  Example
  Output:

  eeksforgeeks
  eeksforgeeks
  geeksforeeks
  eeksforeeks
  forgeeks
  geeksforgeek
  

• To replace characters from a string Boost.StringAlgorithms provides several functions you can use to replace individual characters from a string.
  • replace_first_copy() will replace the first occurrence in the source string.
  • replace_nth_copy() will replace the nth occurrence in the source string.
  • replace_all_copy() will replace all occurrences of a particular character from a string.
  Example

Reference: https://www.boost.org/doc/libs/1_70_0/doc/html/string_algo/reference.html