Misleading documentation for "regexMatch"

[jtagscherer]

First of all, thank you for your very helpful template functions!

Unfortunately, the documentation for the regexMatch function is a bit misleading (and contains a typo). It states that the function returns true if the input string matches the regular expression. However, it returns true if the input string contains any match. The whole input string does not have to match the regular expression. Internally, the function uses the regexp package whose documentation states as much.

The accompanying example hints at being a rudimentary email address matcher, further solidifying this incorrect intuition. However, it does not only accept email addresses, but also any other string containing an email address.

I suggest that this part of the documentation should be made a bit more explicit to reduce mistakes by potential template users.