Forward slash in Java Regex

Question

I can\'t figure out why the following code doesn\'t behave as expected

\"Hello/You/There\".replaceAll(\"/\", \"\\\\/\");

• Expected out

Answer 1

Double escaping is required when presented as a string.

Whenever I'm making a new regular expression I do a bunch of tests with online tools, for example: http://www.regexplanet.com/advanced/java/index.html

That website allows you to enter the regular expression, which it'll escape into a string for you, and you can then test it against different inputs.