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OTP 28 uses PCRE2 for re<\/code>. Re-test expressions carried over from older Erlang releases, especially Unicode classes and unusual escape sequences. See the OTP 28 re reference<\/a>.<\/p>\n

In a practice Erlang shell:<\/p>\n

re:run(<<"Order 123">>, <<"[0-9]+">>, [{capture, first, binary}]).\n% {match,[<<"123">>]}\nre:run(<<"Order abc">>, <<"[0-9]+">>, [{capture, none}]).\n% nomatch\nre:replace(<<"a   b">>, <<"\\\\s+">>, <<" ">>, [global, {return, binary}]).\n% <<"a b">>\n<\/code><\/pre>\n
+<\/code> repeats the preceding expression one or more times; *<\/code> allows zero occurrences too. ^<\/code> and $<\/code> anchor a match. Erlang string and binary literals need an extra backslash to pass a backslash to the regex engine.<\/p>\n
For repeated matching, compile once and handle both success and failure:<\/p>\n
{ok, Pattern} = re:compile(<<"^[0-9]+$">>),\nmatch = re:run(<<"123">>, Pattern, [{capture, none}]),\nnomatch = re:run(<<"abc">>, Pattern, [{capture, none}]).\n<\/code><\/pre>\n
Treat the compiled pattern as opaque. Do not copy its printed internal tuple into source code. For UTF-8 input, use unicode<\/code>; add ucp<\/code> when character classes should use Unicode properties. Do not use a small regex as a complete email-address validator: use the form validator and verify address ownership when required.<\/p>"}},"category_id":{"id":318,"is_a":["meta","category"],"name":"cookbook","title":{"_type":"trans","tr":{"en":"Cookbook"}},"uri":"https:\/\/test.zotonic.com\/id\/318"},"content_group_id":{"id":339,"is_a":["meta","content_group"],"name":"default_content_group","title":{"_type":"trans","tr":{"en":"Default Content Group"}},"uri":"https:\/\/zotonic.com\/id\/default_content_group"},"created":"2020-05-30T05:47:27Z","creator_id":{"id":336,"is_a":["person","robot"],"name":"gitbot","title":"Git","uri":"https:\/\/zotonic.com\/id\/336"},"doc_editorial_bundle":true,"doc_editorial_edges":{"hasreference":[1419,1538],"subject":[2553,2564,2612,2659,2670]},"github_url":"https:\/\/github.com\/zotonic\/zotonic\/tree\/master\/doc\/cookbook\/justenough-re.rst","is_authoritative":true,"is_dependent":false,"is_featured":false,"is_protected":false,"is_published":true,"is_unfindable":false,"language":["en"],"modified":"2026-10-07T11:13:52Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"name":"doc_cookbook_justenough_re","pivot_geocode":null,"pivot_location_lat":null,"pivot_location_lng":null,"privacy":0,"publication_end":"9999-06-01T00:00:00Z","publication_start":"2022-02-15T10:01:41Z","slug":"use-regular-expressions-with-erlang-otp-28","summary":{"_type":"trans","tr":{"en":"Match and replace UTF-8 text with the current re module."}},"title":{"_type":"trans","tr":{"en":"Use regular expressions with Erlang\/OTP 28"}},"title_slug":{"_type":"trans","tr":{"en":"use-regular-expressions-with-erlang-otp-28"}},"tz":"UTC","uri":null,"version":35,"visible_for":0},"uri":"https:\/\/zotonic.com\/id\/1601","uri_template":"https:\/\/zotonic.com\/id\/:id","version":35,"websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/1601"}},"status":"ok"}