Regex Editor & Tester

Matches UK National Highways Strategic Road Network geographic address identifiers: a road number (motorway like M1 or M6T, or an A/B road optionally with a motorway suffix like A38M), followed by a hyphen, then a 1-4 digit location/marker reference ending in a letter (A, B, J, K, L, M) and an optional trailing digit. Commonly used to extract or validate road location codes from Highways England datasets, asset registers, and Street Manager records. The multiline flag lets it find these codes on any line of multi-line input.