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?
