source: node_modules/prismjs/components/prism-nim.js

Prism.languages.nim = {
        'comment': {
                pattern: /#.*/,
                greedy: true
        },
        'string': {
                // Double-quoted strings can be prefixed by an identifier (Generalized raw string literals)
                pattern: /(?:\b(?!\d)(?:\w|\\x[89a-fA-F][0-9a-fA-F])+)?(?:"""[\s\S]*?"""(?!")|"(?:\\[\s\S]|""|[^"\\])*")/,
                greedy: true
        },
        'char': {
                // Character literals are handled specifically to prevent issues with numeric type suffixes
                pattern: /'(?:\\(?:\d+|x[\da-fA-F]{0,2}|.)|[^'])'/,
                greedy: true
        },

        'function': {
                pattern: /(?:(?!\d)(?:\w|\\x[89a-fA-F][0-9a-fA-F])+|`[^`\r\n]+`)\*?(?:\[[^\]]+\])?(?=\s*\()/,
                greedy: true,
                inside: {
                        'operator': /\*$/
                }
        },
        // We don't want to highlight operators (and anything really) inside backticks
        'identifier': {
                pattern: /`[^`\r\n]+`/,
                greedy: true,
                inside: {
                        'punctuation': /`/
                }
        },

        // The negative look ahead prevents wrong highlighting of the .. operator
        'number': /\b(?:0[xXoObB][\da-fA-F_]+|\d[\d_]*(?:(?!\.\.)\.[\d_]*)?(?:[eE][+-]?\d[\d_]*)?)(?:'?[iuf]\d*)?/,
        'keyword': /\b(?:addr|as|asm|atomic|bind|block|break|case|cast|concept|const|continue|converter|defer|discard|distinct|do|elif|else|end|enum|except|export|finally|for|from|func|generic|if|import|include|interface|iterator|let|macro|method|mixin|nil|object|out|proc|ptr|raise|ref|return|static|template|try|tuple|type|using|var|when|while|with|without|yield)\b/,
        'operator': {
                // Look behind and look ahead prevent wrong highlighting of punctuations [. .] {. .} (. .)
                // but allow the slice operator .. to take precedence over them
                // One can define his own operators in Nim so all combination of operators might be an operator.
                pattern: /(^|[({\[](?=\.\.)|(?![({\[]\.).)(?:(?:[=+\-*\/<>@$~&%|!?^:\\]|\.\.|\.(?![)}\]]))+|\b(?:and|div|in|is|isnot|mod|not|notin|of|or|shl|shr|xor)\b)/m,
                lookbehind: true
        },
        'punctuation': /[({\[]\.|\.[)}\]]|[`(){}\[\],:]/
};