escape non-metacharacters (XML spec)

[alexandernorth]

The set of metacharacters is not the same between XML schema and perl/python/go Regular Expressions.

The set of metacharacters for XML schema is: .\?*+{}()[] (reference)
the set of metacharacters defined in go is: \.+*?()|[]{}^$ (go/libexec/src/regexp/regexp.go:714)

To maintain compatibility, we need to force escape the difference in these two sets (^ and $).
^ is a bit special as it is a valid metacharacter as the first char after the opening of a character set ([^...) so we make sure not to escape it in this position

[steiler]

lgtm

[hansthienpondt]

lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 64.86486% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/utils/leaf_convert.go	64.86%	13 Missing ⚠️

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