I'd like to use mustache style for expression: {{abc}}, it's pretty easy to write /({{[a-z]+}})/.
However I cannot get it right to handle \{{abc}}, for which I'd like to skip them on match list. I tried /((?!\\)({{[a-z]+}}))/ but it doesn't work.
Use
(?<!\\)(?:\\\\)*\K{{[a-z]+}}
See proof
Explanation
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(?<! look behind to see if there is not:
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\\ '\'
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) end of look-behind
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(?: group, but do not capture (0 or more times
(matching the most amount possible)):
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\\ '\'
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\\ '\'
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)* end of grouping
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\K match reset operator
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{{ '{{'
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[a-z]+ any character of: 'a' to 'z' (1 or more
times (matching the most amount possible))
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}} '}}'