# std::sub_match<BidirIt>::compare

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< cpp‎ | regex‎ | sub match

int compare( const sub_match& m ) const; | (1) | (since C++11)
int compare( const string_type& s ) const; | (2) | (since C++11)
int compare( const value_type* c ) const; | (3) | (since C++11)

1) Compares two sub_match directly by comparing their underlying character sequences. Equivalent to str().compare(m.str()).
2) Compares a sub_match with a std::basic_string. Equivalent to str().compare(s).
3) Compares a sub_match with a null-terminated sequence of the underlying character type pointed to by `s`. Equivalent to str().compare(c).

This function is infrequently used directly by application code. Instead, one of the non-member comparison operators are used.

### Parameters

m | - | a reference to another sub_match
s | - | a reference to a string to compare to
c | - | a pointer to a null-terminated character sequence of the underlying value_type to compare to

### Return value

A value less than zero if this sub_match is less than the other character sequence, zero if the both underlying character sequences are equal, greater than zero if this sub_match is greater than the other character sequence.

### Example

| This section is incomplete Reason: no example

### See also

compare | compares two strings (public member function of `std::basic_string<CharT,Traits,Allocator>`)
str operator string_type | converts to the underlying string type (public member function)
operator==operator!=operator<operator<=operator>operator>= | compares two `sub_match` objects (function template)

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