Simple inverse-regex style template language, for use in replacements
At replacements, provides several patterns:
| Pattern | Inserts |
| ------- | ------- |
| $$ | Literal "$" |
| $n, where n - number | Indexed match, i.e str.replace("aaa(bbb)", "$1aaa") == "bbbaaa". Zero index is reserved for full match. If specified group does not exists - then throws error, see below for error handling |
| $<name>, where name - string | Named match, i.e str.replace("aaa(?P<name>bbb)", "$<name>aaa") == "bbbaaa". If specified group does not exists - then throws error |
| \\ | Literal "\" |
| \ | Literal " " |
| \xnn, where n - hex digit | Insert literal byte with hex code 0xnn |
| (expr1\|expr2\|expr3...), where expr - replacement expression | Try to execute expr1, if error is thrown (see above) - then try next expression, if no expression is matched - throw error |
Expression may start with (?x), this makes parser ignore whitespace, and allows writing comments
```
(?x)
$