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

Prism.languages.iecst = {
        'comment': [
                {
                        pattern: /(^|[^\\])(?:\/\*[\s\S]*?(?:\*\/|$)|\(\*[\s\S]*?(?:\*\)|$)|\{[\s\S]*?(?:\}|$))/,
                        lookbehind: true,
                        greedy: true,
                },
                {
                        pattern: /(^|[^\\:])\/\/.*/,
                        lookbehind: true,
                        greedy: true,
                },
        ],
        'string': {
                pattern: /(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
                greedy: true,
        },
        'keyword': [
                /\b(?:END_)?(?:PROGRAM|CONFIGURATION|INTERFACE|FUNCTION_BLOCK|FUNCTION|ACTION|TRANSITION|TYPE|STRUCT|(?:INITIAL_)?STEP|NAMESPACE|LIBRARY|CHANNEL|FOLDER|RESOURCE|VAR_(?:ACCESS|CONFIG|EXTERNAL|GLOBAL|INPUT|IN_OUT|OUTPUT|TEMP)|VAR|METHOD|PROPERTY)\b/i,
                /\b(?:AT|BY|(?:END_)?(?:CASE|FOR|IF|REPEAT|WHILE)|CONSTANT|CONTINUE|DO|ELSE|ELSIF|EXIT|EXTENDS|FROM|GET|GOTO|IMPLEMENTS|JMP|NON_RETAIN|OF|PRIVATE|PROTECTED|PUBLIC|RETAIN|RETURN|SET|TASK|THEN|TO|UNTIL|USING|WITH|__CATCH|__ENDTRY|__FINALLY|__TRY)\b/
        ],
        'class-name': /\b(?:ANY|ARRAY|BOOL|BYTE|U?(?:D|L|S)?INT|(?:D|L)?WORD|DATE(?:_AND_TIME)?|DT|L?REAL|POINTER|STRING|TIME(?:_OF_DAY)?|TOD)\b/,
        'address': {
                pattern: /%[IQM][XBWDL][\d.]*|%[IQ][\d.]*/,
                alias: 'symbol'
        },
        'number': /\b(?:16#[\da-f]+|2#[01_]+|0x[\da-f]+)\b|\b(?:D|DT|T|TOD)#[\d_shmd:]*|\b[A-Z]*#[\d.,_]*|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?/i,
        'boolean': /\b(?:FALSE|NULL|TRUE)\b/,
        'operator': /S?R?:?=>?|&&?|\*\*?|<[=>]?|>=?|[-:^/+#]|\b(?:AND|EQ|EXPT|GE|GT|LE|LT|MOD|NE|NOT|OR|XOR)\b/,
        'function': /\b[a-z_]\w*(?=\s*\()/i,
        'punctuation': /[()[\].,;]/,
};