Enables ECMAScript-compliant behavior for the expression. This flag can be used only in conjunction with the IgnoreCase, Multiline, and Compiled flags.

Specifies that the only valid captures are explicitly named or numbered groups of the form.

Eliminates unescaped white space from the pattern and enables comments marked with #.

Multiline mode. Changes the meaning of ^ and $ so they match at the beginning and end, respectively, of any line, and not just the beginning and end of the entire string.

Specifies that no options are set.

Specifies that the search will be from right to left instead of from left to right.

Specifies single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except \n).