pluralize() throws on BoxLang for words ending in -ex, -lf or -rf #4185

On BoxLang, pluralize() throws for common words ending in -ex or in -lf / -rf:

pluralize("vertex")  // Index -1 out of bounds for length 4
pluralize("index")   // same
pluralize("half")    // Index -1 out of bounds for length 5
pluralize("shelf")   // same
pluralize("wolf")    // same

Lucee and Adobe ColdFusion return vertices, indices, halves, shelves and wolves. Because model names and association names go through pluralize(), a model named Shelf or Index can fail on BoxLang.

Cause. Two pluralize rules in vendor/wheels/global/strings.cfm combine alternatives in a single regex, and only one alternative sets group 1:

• (matr|vert|ind)ix|ex$ → \1ices. For vertex the ex$ alternative matches, so \1 is unset.
• (?:([^f])fe|([lr])f)$ → \1\2ves. For half the ([lr])f alternative matches, so \1 is unset.

Lucee and Adobe replace an unset group with an empty string. BoxLang throws.

Fix. Split each rule into two, so every group a replacement refers to takes part in its match. Output on Lucee and Adobe is unchanged.