sewer-replacement

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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)
$<group1> # Insert group 1
==
$<group2> # Insert group 2

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