The search function *key:valuefragment* is what you are looking for (described in the find window). *No RegExp* needed. Your key contains the ":" which may be is a problem here as JOSM uses it as a special character in the search syntax. You * Use this: `roof\:material:some` (you can [escape](//en.wikipedia.org/wiki/Escape_character) it with the "\" (like in RegExps). Use this: `roof\:material:some` . RegExps)). * Or use this: `"roof:material":some` (the enclosing in doublequotes disables the special meaning of the ":"). See ":" - see the last but one entry in the [search examples](//wiki.openstreetmap.org/wiki/JOSM/Search_function).examples](//wiki.openstreetmap.org/wiki/JOSM/Search_function)).

*key:valuefragment* is what you are looking for (described in the find window). *No RegExp* needed. Your key contains the ":" which may be a problem here as JOSM uses it as a special character in the syntax. It seems you You can [escape](//en.wikipedia.org/wiki/Escape_character) it with the "\" (like in RegExps). Use this: `roof\:material:some`.`roof\:material:some` . Or use this: `"roof:material":some` (the enclosing in doublequotes disables the special meaning of the ":"). See the last but one entry in the [search examples](//wiki.openstreetmap.org/wiki/JOSM/Search_function).

*key:valuefragment* is what you are looking for (described in the find window). *No RegExp* needed. Your key contains the ":" which may be a problem here as JOSM uses it as a special character in the syntax. It seems you can [escape](//en.wikipedia.org/wiki/Escape_character) it with the "\" (like in RegExps). Use this: `roof\:material:some`.