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![d&d: This item
reter
won't scan.
STufe
That must mean it's
CUSTOMER OF
THE YEAR
for full retail price because
technological errors do not
entitle me to a discount
D
D
[OC] And the customer of the year award goes to…](https://pics.onsizzle.com/this-item-reter-wont-scan-stufe-that-must-mean-its-65822359.png)
![d&d: This item
reter
won't scan.
STufe
That must mean it's
CUSTOMER OF
THE YEAR
for full retail price because
technological errors do not
entitle me to a discount
D
D
[OC] And the customer of the year award goes to…](https://pics.onsizzle.com/this-item-reter-wont-scan-stufe-that-must-mean-its-65822363.png)
![d&d: Is there a regular expression to detect a valid regular expression?
Asked 10 years, 11 months ago Active 4 days ago Viewed 192k times
Is it possible to detect a valid regular expression with another regular expression? If so please give
example code below
941
regex
# start of string
first group start
938
(?:
(?:[^?+**{}()[\]W]+
# literals and ^, $
escaped characters
character classes
I N (?: \^?\\.| M[^\\] | [^l\^] )
(?: [^\]\\]+ | \i. )* \]
INC (?:\?[:=!]]\?< [=!] |\?>) ? (?1)?? \) # parenthesis, with recursive content
I \(\? (?:R|[+-]?\d+) \)
recursive matching
|(?: (?:[?+*]|\{\d+(?:,\d*)?\}) [+]? )?
quantifiers
# alternative
# repeat content
# end first group
# end of string
This is a recursive regex, and is not supported by many regex engines. PCRE based ones should
support it
T used the regular expression to devaldateoy the regular expresions
And it nearly killed me](https://pics.onsizzle.com/is-there-a-regular-expression-to-detect-a-valid-regular-62916646.png)
![d&d: @jhopesolo
@ 74%
ll T-Mobile
1:54 PM
Tweet
Donald J. Trump
@realDonaldTrump
[WTT] exo: Love Shot
Location: US
Have: Xiumin Shot Ver
Chen Love Ver
Want: Sehun Love Ver
Sehun Shot ver
ww: prefer US/Canada will consider
worldwide if you really want it
LOY
SHO
EXO
avthe d D t
EXO memes](https://pics.onsizzle.com/jhopesolo-74-ll-t-mobile-1-54-pm-tweet-donald-j-59524366.png)
