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C++ Library - <regex> Introduction

It is a standardized way to express patterns to be matched against sequences of characters. some of typical regex parameters are as shown below −

Target sequence (subject) − It is used to searched for the sequence pattern.
Regular expression (pattern) − It is used to searched for in the target sequence.
Matches array − Matches information is stored in one of the special match_results array types (such as cmatch or smatch).
Replacement strin − This operation replaces the matches.

Regex operations Iterator types basic_regex instantiations Sr.No. Instantiation & description 1 regex

It is a regex class.

It is a wregex class.

match_results instantiations Sr.No. match_results instantiation & description 1 cmatch

These are match_results for string literals.

These are match_results for wide string literals.

These are match_results for string objects.

These are match_results for wide string objects.

sub_match instantiations Sr.No. sub_match instantiation & description 1 csub_match

It is a sub_match for string literals.

It is a sub_match for wide string literals.

It is a sub_match for strings.

It is a sub_match for wide strings.

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