regex Header

Regular expressions library

• https://en.cppreference.com/w/cpp/header/regex

Functions

Algorithms

regex_replace()

info

regex_replace(theString, regexVariable, replacementElement) _, Here, regexVariable means the Regular Expression which has be replaced

• https://en.cppreference.com/w/cpp/regex/regex_replace

replaces occurrences of a regular expression with formatted replacement text

string str;    // Hello    World
getline(cin, str);

regex r("\\s+"); // "\\s+" consists of all white spaces 'tabs' or ' ' or '   '
str = regex_replace(str, r, "");    //👉 replaces all "\\s+" with "" (no space)

cout << str << endl;    //prints  "HelloWorld"

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regex_match()

• attempts to match a regular expression to an entire character sequence

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regex_search()

• attempts to match a regular expression to any part of a character sequence

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