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## syntax errors
{{ abcdef /Missing closing braces/ unterminated closure
\1 abcdef /reserved/ back references
\x[ abcdef /Missing close bracket/ unterminated \x[..]
\X[ abcdef /Missing close bracket/ unterminated \X[..]
* abc abcdef /Quantifier follows nothing/ bare * at start
* abc abcdef /Quantifier follows nothing/ bare * after ws
[*|a] abcdef /Quantifier follows nothing/ bare * after [
[ *|a] abcdef /Quantifier follows nothing/ bare * after [+sp
[a|*] abcdef /Quantifier follows nothing/ bare * after |
[a| *] abcdef /Quantifier follows nothing/ bare * after |+sp
+ abc abcdef /Quantifier follows nothing/ bare + at start
+ abc abcdef /Quantifier follows nothing/ bare + after ws
[+|a] abcdef /Quantifier follows nothing/ bare + after [
[ +|a] abcdef /Quantifier follows nothing/ bare + after [+sp
[a|+] abcdef /Quantifier follows nothing/ bare + after |
[a| +] abcdef /Quantifier follows nothing/ bare + after |+sp
? abc abcdef /Quantifier follows nothing/ bare ? at start
? abc abcdef /Quantifier follows nothing/ bare ? after ws
[?|a] abcdef /Quantifier follows nothing/ bare ? after [
[ ?|a] abcdef /Quantifier follows nothing/ bare ? after [+sp
[a|?] abcdef /Quantifier follows nothing/ bare ? after |
[a| ?] abcdef /Quantifier follows nothing/ bare ? after |+sp
: abc abcdef /Quantifier follows nothing/ bare : at start
: abc abcdef /Quantifier follows nothing/ bare : after ws
[:|a] abcdef /Quantifier follows nothing/ bare : after [
[ :|a] abcdef /Quantifier follows nothing/ bare : after [+sp
[a|:] abcdef /Quantifier follows nothing/ bare : after |
[a| :] abcdef /Quantifier follows nothing/ bare : after |+sp
abcdef /'Null pattern'/ null pattern
abcdef /'Null pattern'/ ws null pattern
=abc abcdef /LHS of alias must be lvalue/ bare : after ws
[ =a] abcdef /LHS of alias must be lvalue/ bare : after [+sp
[a| =a] abcdef /LHS of alias must be lvalue/ bare : after |+sp
\b abcdef /Unsupported/ bare \b
\B abcdef /Unsupported/ bare \B
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