Regular Expressions are powerful… and terrifying. One minute you’re matching simple patterns,the next you’re staring at something like: ^(?:(?:+?1\s*(?:[.-]\s*)?)?(?:\s∗\d3\s∗\s∗\d3\s∗|\d{3})(?:[.-]\s*)?\d{3}(?:[.-]\s*)?\d{4})$ …and you start questi...
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