MongoDB\BSON\Regex::__construct Construct a new Regex &reftitle.description; final public MongoDB\BSON\Regex::__construct stringpattern stringflags"" &reftitle.parameters; pattern (string) The regular expression pattern. The pattern should not be wrapped with delimiter characters. flags (string) The regular expression flags. Characters in this argument will be sorted alphabetically. &reftitle.errors; &mongodb.throws.argumentparsing; Throws MongoDB\Driver\Exception\InvalidArgumentException if pattern or flags contain null bytes. &reftitle.changelog; &Version; &Description; 1.2.0 The flags argument is optional and defaults to an empty string. Characters in the flags argument will be sorted alphabetically when a Regex is constructed. Previously, the characters were stored in the order provided. MongoDB\Driver\Exception\InvalidArgumentException is thrown if pattern or flags contain null bytes. Previously, values would be truncated at the first null byte. &reftitle.examples; ]]> &example.outputs; string(4) "^foo" ["flags"]=> string(1) "i" } ]]> &reftitle.seealso; BSON Types Supported regular expression flags