Regular Expressions 101

Pro

Group 1(^((?!error|empty).)*$)

^start of line

Group 2((?!error|empty).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!error|empty)

1st Alternativeerror

errorthe literal text error (case sensitive)

2nd Alternativeempty

emptythe literal text empty (case sensitive)

.any Unicode character (except for line terminators)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(^((?!error|empty).)*$)

New

varformals : PAR_OPEN PAR_CLOSE {}
| PAR_OPEN varform PAR_CLOSE {}
/* error / | error PAR_CLOSE {}
/ error / | error varform PAR_CLOSE {}
/ error */ | PAR_OPEN error PAR_CLOSE {}
;