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The remaining predefined character set, decomposables , is derived from the decomposition type and mapping of characters. Method (System) | Microsoft Docs

Perhaps the most common use for Character Set is to remove leading and trailing whitespace from text. In addition to the aforementioned constants, Character Set provides predefined values that correspond to the characters allowed in various components of a URL :. Only certain characters are allowed in certain parts of a URL without first being escaped.

URLComponents takes care of percent-encoding components automatically, but you can replicate this functionality yourself using the adding Percent Encoding with Allowed Characters: method and passing the appropriate character set:. In addition to these predefined character sets, you can create your own.

iOS: Remove Leading and Trailing Whitespaces in NSString Object

Build them up character by character, inserting multiple characters at a time by passing a string, or by mixing and matching any of the predefined sets. You might create a Character Set to validate some user input to, for example, allow only lowercase and uppercase letters, digits, and certain punctuation. If a Character Set is created as the result of an expensive operation, you may consider caching its bitmap Representation for later reuse.

Lowercase each word Turns the first letter of each word of the provided text into lower case.

Trim left Removes any leading space characters of the provided text. Trim right Removes any trailing space characters of the provided text.

Position of text Returns the position of the first occurrence of a provided text inside the provided text. It returns 0 if the search term is not found. This macro function is case-sensitive.

How to remove a character (char) from a string in C/C++

Replace text Replaces the provided text in the provided Text. This macro is case-sensitive. To replace a pipe char the vertical dash , it needs to be "escaped" with another pipe char.


Substring extraction Extracts the partial string beginning at the position as defined with the provided length. Example: You can extract 5 characters beginning from the 2rd character of a text.