CODEWITHSUNDEEP
regexerlang
lht
lht

Reputation: 378

Multiline Regular Expression with Erlang re module

Failed to get Erlang re work for multiline, please help!

> re:run("hello,\nworld", "o,.*w", [multiline]).
nomatch
> re:run("hello,\nworld", "o,.*w", [multiline, {newline, lf}]).
nomatch

> {ok, MP} = re:compile("o,.*w", [multiline]).
{ok,{re_pattern,0,0,
                <<69,82,67,80,55,0,0,0,2,0,0,0,7,0,0,0,0,0,0,0,111,0,
                  119,...>>}}
> re:run("hello,\nworld", MP).
nomatch

> re:run("hello,\nworld", ",\nw").
{match,[{5,3}]}

Upvotes: 2

Views: 1381

Answers (2)

Bart Kiers
Bart Kiers

Reputation: 170158

The multiline option only tells the regex engine to treat ^ not only as the start of the string, but also as the start of a new line and it also tells the engine to treat $ not only as the end of the string, but as the end of a line.

Try this instead: 

re:run("hello,\nworld", "o,.*w", [dotall])

The dotall option will tell the regex engine to also let line breaks be matched by the DOT meta character.

Upvotes: 7

Lukas
Lukas

Reputation: 5327

use the dotall option, i.e. 

> re:run("hello,\nworld", "o,.*w", [dotall]).
{match,[{4,4}]}

Upvotes: 2

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