Support string concatenation #65
Description
It'd be very useful if anchors of strings could be used in strings or combined with other strings, as my entire reason for using anchors (and yaml) were the need for reused & built-up strings.
Example:
forbidden: &forbidden '@\s\[\]\(\)\\'
escaped: &escaped '\\\[|\\\]|\\\(|\\\)|\\\@|\\\\'
text: '([^*forbidden]|*escaped)+'
Expected:
forbidden: '@\s\[\]\(\)\\'
escaped: '\\\[|\\\]|\\\(|\\\)|\\\@|\\\\'
text: '([^@\s\[\]\(\)\\]|\\\[|\\\]|\\\(|\\\)|\\\@|\\\\)+'
Or something like:
a: &a a
b: &b b
c: *a '|' *c # => c: 'a | b'