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SyntaxError: invalid character in class in regular expression - JavaScript

The JavaScript exception "invalid character in class in regular expression" occurs when a character appears in a v-mode character class but it's not allowed to appear literally.

SyntaxError: Invalid regular expression: /[|]/v: Invalid character in character class (V8-based)
SyntaxError: invalid character in class in regular expression (Firefox)
SyntaxError: Invalid regular expression: invalid class set character (Safari)

Normally, character classes can contain almost all characters literally. However, the v mode made the character class syntax more sophisticated, and in order to leave room for future syntax extensions, some syntax characters are forbidden from appearing literally in a character class. They include: (, ), [, ], {, }, /, -, |. If you want to match these literal characters, escape them; for example: /[\|]/v.

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