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

Prism.languages.eiffel = {
        'comment': /--.*/,
        'string': [
                // Aligned-verbatim-strings
                {
                        pattern: /"([^[]*)\[[\s\S]*?\]\1"/,
                        greedy: true
                },
                // Non-aligned-verbatim-strings
                {
                        pattern: /"([^{]*)\{[\s\S]*?\}\1"/,
                        greedy: true
                },
                // Single-line string
                {
                        pattern: /"(?:%(?:(?!\n)\s)*\n\s*%|%\S|[^%"\r\n])*"/,
                        greedy: true
                }
        ],
        // normal char | special char | char code
        'char': /'(?:%.|[^%'\r\n])+'/,
        'keyword': /\b(?:across|agent|alias|all|and|as|assign|attached|attribute|check|class|convert|create|Current|debug|deferred|detachable|do|else|elseif|end|ensure|expanded|export|external|feature|from|frozen|if|implies|inherit|inspect|invariant|like|local|loop|not|note|obsolete|old|once|or|Precursor|redefine|rename|require|rescue|Result|retry|select|separate|some|then|undefine|until|variant|Void|when|xor)\b/i,
        'boolean': /\b(?:False|True)\b/i,
        // Convention: class-names are always all upper-case characters
        'class-name': /\b[A-Z][\dA-Z_]*\b/,
        'number': [
                // hexa | octal | bin
                /\b0[xcb][\da-f](?:_*[\da-f])*\b/i,
                // Decimal
                /(?:\b\d(?:_*\d)*)?\.(?:(?:\d(?:_*\d)*)?e[+-]?)?\d(?:_*\d)*\b|\b\d(?:_*\d)*\b\.?/i
        ],
        'punctuation': /:=|<<|>>|\(\||\|\)|->|\.(?=\w)|[{}[\];(),:?]/,
        'operator': /\\\\|\|\.\.\||\.\.|\/[~\/=]?|[><]=?|[-+*^=~]/
};