使用 Erlang re 模块的多行正则表达式
无法让 Erlang 重新工作于多行，请帮忙！
> 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}]}
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}]}
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multiline选项仅告诉正则表达式引擎将^不仅视为字符串的开头，而且还视为新行的开头，并且还告诉引擎将$不仅视为字符串的结尾，而且视为行的结尾。请尝试这样做：
dotall选项将告诉正则表达式引擎也让换行符与点元字符匹配。The
multilineoption only tells the regex engine to treat^not only as the start of the string, but also as the start of a new line and it also tells the engine to treat$not only as the end of the string, but as the end of a line.Try this instead:
The
dotalloption will tell the regex engine to also let line breaks be matched by the DOT meta character.使用 dotall 选项，即
use the dotall option, i.e.