Hey all,
I'm currently trying to port my small toy language I invented
awhile back in Java to D. However, a main part of my lexical
analyzer was regular expression matching, which I've been having
issues with in D. The regex expression in question is as follows:
[ 0-9a-zA-Z.*=+-;()\"\'\[\]<>,{}^#/\\]
This works well enough in Java to produce a series of tokens that
I could then pass to my parser. But when I tried to port this
into D, I almost always get an error when using brackets, braces,
or parenthesis. I've tried several different combinations, have
looked through the std.regex library reference, have Googled this
issue, have tested my regular expression in several online-regex
testers (primarily http://regexpal.com/, and
http://regexhelper.com/), and have even looked it up in the book,
"The D Programming Language" (good book, by the way), yet I still
can't get it working right. Here's the code I've been using:
...
auto tempCont = cast(char[])read(location, fileSize);
string contents = cast(string)tempCont;
auto reg = regex("[ 0-9a-zA-Z.*=+-;()\"\'\[\]<>,{}^#/\\]");
auto m = match(contents, reg);
auto token = m.captures
...
When I try to run the code above, I get:
parser.d(64): Error: undefined escape sequence \[
parser.d(64): Error: undefined escape sequence \]
When I remove the escaped characters (turning my regex into
"[ 0-9a-zA-Z.*=+-;()\"\'[]<>,{}^#/\\]"), I get no issues
compiling or linking. However, on first run, I get the following
error (I cut the error short, full error is pasted
http://pastebin.com/vjMhkx4N):
std.regex.RegexException@/usr/include/dmd/phobos/std/regex.d(1942):
wrong CodepointSet
Pattern with error: `[ 0-9a-zA-Z.*=+-;()"'[]` <--HERE--
`<>,{}^#/\]`
I'm very confused on what to do, and much of the information in
the library reference seems to contradict what I'm doing. Any
help would greatly appreciated!
Thanks!
~Mr. Appleseed
Additional information:
OS/Compiler information:
Ubuntu 12.10 x64
DMD64 D Compiler v2.061
Compiled with:
dmd main.d parser.d
