Benno Schulenberg 2f216281e7 syntax: yaml: allow slash and period in key names
Some Yaml files use path names and sometimes version numbers as keys,
even though / and . are not officially in the character set allowed
for key names (just like underscore is not), as far as I understand.

Also, do not colorize any backslash escapes as invalid
because some of them occur sometimes in value strings.

Also, colorize only the valid double-exclamation tags.
2021-10-03 15:38:43 +02:00
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