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A practical walkthrough of using JavaScript regular expressions to parse plus-minus (±) range expressions entered by engineers in a manufacturing web UI. Because humans write tolerances inconsistently (e.g., '30mm +- 0.5', '30+/-0.5', '30 ± .5'), a flexible regex is built by composing a number pattern and a plus-minus separator pattern via their `.source` properties. The combined pattern extracts base and delta values, which are then used to automatically compute upper and lower bounds using `parseFloat()` and basic arithmetic.

Parsing Plus-Minus Ranges Using RegExp In JavaScript

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