failing regex

[Rikki Cattermole via Digitalmars-d-learn]

On 23/11/15 9:30 PM, yawniek wrote:
> regex from
> https://github.com/ua-parser/uap-core/blob/master/regexes.yaml#L38
> seems to work in other languages, not so in D:
>
> auto r2 = r"(?:\/[A-Za-z0-9\.]+)? *([A-Za-z0-9
> _\!\[\]:]*(?:[Aa]rchiver|[Ii]ndexer|[Ss]craper|[Bb]ot|[Ss]pider|[Cc]rawl[a-z]*))
> (\d+)(?:\.(\d+)(?:\.(\d+))?)?".regex();
>
> ( https://gist.github.com/4334e35e68497c0517db )
>
> results in
>
> ```
> dmd -run failing_regex.d
> std.regex.internal.ir.RegexException@/usr/local/Cellar/dmd/2.069.0/include/d2/std/regex/internal/parser.d(1392):
> invalid escape sequence
> Pattern with error: `(?:\/[A-Za-z0-9\.]+)? *([A-Za-z0-9 _\!` <--HERE--
> `\[\]:]*(?:[Aa]rchiver|[Ii]ndexer|[Ss]craper|[Bb]ot|[Ss]pider|[Cc]rawl[a-z]*))
> (\d+)(?:\.(\d+)(?:\.(\d+))?)?`
> ----------------
> 4   dmd_run68HuB5                       0x00000001044d211d @trusted void
> std.regex.internal.parser.Parser!(immutable(char)[]).Parser.error(immutable(char)[])
> + 297
> 5   dmd_run68HuB5                       0x00000001044da604 ref @trusted
> std.regex.internal.parser.Parser!(immutable(char)[]).Parser
> std.regex.internal.parser.Parser!(immutable(char)[]).Parser.__ctor!(const(char)[]).__ctor(immutable(char)[],
> const(char)[]) + 160
> 6   dmd_run68HuB5                       0x00000001044cc732 @safe
> std.regex.internal.ir.Regex!(char).Regex
> std.regex.regexImpl!(immutable(char)[]).regexImpl(immutable(char)[],
> const(char)[]) + 86
> 7   dmd_run68HuB5                       0x00000001044e944f
> std.regex.internal.ir.Regex!(char).Regex
> std.functional.__T7memoizeS95_D3std5regex18__T9regexImplTAyaZ9regexImplFNfAyaAxaZS3std5regex8internal2ir12__T5RegexTaZ5RegexVii8Z.memoize(immutable(char)[],
> const(char)[]) + 475
> 8   dmd_run68HuB5                       0x00000001044cc6bc @trusted
> std.regex.internal.ir.Regex!(char).Regex
> std.regex.regex!(immutable(char)[]).regex(immutable(char)[],
> const(char)[]) + 64
> 9   dmd_run68HuB5                       0x00000001044cc5de _Dmain + 46
> 10  dmd_run68HuB5                       0x0000000104509ac3
> D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv + 39
> 11  dmd_run68HuB5                       0x00000001045099fb void
> rt.dmain2._d_run_main(int, char**, extern (C) int
> function(char[][])*).tryExec(scope void delegate()) + 55
> 12  dmd_run68HuB5                       0x0000000104509a68 void
> rt.dmain2._d_run_main(int, char**, extern (C) int
> function(char[][])*).runAll() + 44
> 13  dmd_run68HuB5                       0x00000001045099fb void
> rt.dmain2._d_run_main(int, char**, extern (C) int
> function(char[][])*).tryExec(scope void delegate()) + 55
> 14  dmd_run68HuB5                       0x000000010450994d _d_run_main +
> 497
> 15  dmd_run68HuB5                       0x00000001044cc677 main + 15
> 16  libdyld.dylib                       0x00007fff8e5185c8 start + 0
> 17  ???                                 0x0000000000000000 0x0 + 0
>
> ```
>
>
> bug or did i do something wrong?

Its the: \!
Don't escape !.