Support trivial regular expressions with special escaped characters
Support trivial regular expressions with special escaped characters

When a regular expression contains escaped characters such as the
backslash, it is actually still a literal string. So let's support the
trivially-escaped characters, too, that are documented in

	http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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