Fix the Chapel lexer's parsing of string literals

The Chapel lexer was trying to parse both the single and double quoted forms of
string literals with a single regex rule. This lead to errors on input like:

 "I'm a string literal!"

The fix was to split the rule out into a ' and " version.

1 files changed, 2 insertions, 1 deletions

diff --git a/pygments/lexers/chapel.py b/pygments/lexers/chapel.py
index 5b7be4dd..d69c55f5 100644
--- a/pygments/lexers/chapel.py
+++ b/pygments/lexers/chapel.py
@@ -77,7 +77,8 @@ class ChapelLexer(RegexLexer):
             (r'[0-9]+', Number.Integer),
 
             # strings
-            (r'["\'](\\\\|\\"|[^"\'])*["\']', String),
+            (r'"(\\\\|\\"|[^"])*"', String),
+            (r"'(\\\\|\\'|[^'])*'", String),
 
             # tokens
             (r'(=|\+=|-=|\*=|/=|\*\*=|%=|&=|\|=|\^=|&&=|\|\|=|<<=|>>=|'