Kaloyan Iliev Iliev <[EMAIL PROTECTED]> writes:
> libvar=# select '\\a\\à\\à\\.' ~ '\\a\\à\\à\\.';
> ERROR:  invalid regular expression: invalid escape \ sequence

7.4 and later are stricter about the use of \ than prior versions; see 
http://www.postgresql.org/docs/7.4/static/functions-matching.html#POSIX-ESCAPE-SEQUENCES
You could go back to (approximately) the old behavior by changing
regex_flavor to "extended".

                        regards, tom lane

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