v7.0.0 -
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Constants
COLUMN_NAME_WITH_ORDER = / \A ( (?: # table_name.column_name | function(one or no argument) ((?:\w+\.)?\w+) | \w+\((?:|\g<2>)\) ) (?:\s+ASC|\s+DESC)? (?:\s+NULLS\s+(?:FIRST|LAST))? ) (?:\s*,\s*\g<1>)* \z /ix
COLUMN_NAME = / \A ( (?: # table_name.column_name | function(one or no argument) ((?:\w+\.)?\w+) | \w+\((?:|\g<2>)\) ) (?:(?:\s+AS)?\s+\w+)? ) (?:\s*,\s*\g<1>)* \z /ix