C++ Library - <regex>

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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

Sr.No. Regex operation & description
1 regex_match

It is a match sequence.
2 regex_search

It is a search sequence.
3 regex_replace

It is a replace matched sequence.

Iterator types

Sr.No. Iterator type & description
1 regex_iterator

It is a regex iterator.
2 regex_token_iterator

It is a regex token iterator.

basic_regex instantiations

Sr.No. Instantiation & description
1 regex

It is a regex class.
2 wregex

It is a wregex class.

match_results instantiations

Sr.No. match_results instantiation & description
1 cmatch

These are match_results for string literals.
2 wcmatch

These are match_results for wide string literals.
3 smatch

These are match_results for string objects.
4 wsmatch

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.
2 wcsub_match

It is a sub_match for wide string literals.
3 ssub_match

It is a sub_match for strings.
4 wssub_match

It is a sub_match for wide strings.

Namespaces

Sr.No. Namespace & description
1 regex_constants

It is a regex constants.
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