(P1793)

((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|$(?:\?[:=!]|\?<[=!]|\?>)?(?1)??$|$\?(?:R|[+-]?\d+)$)(?:(?:[?+*]|\{\d+(?:,\d*)?\})[?+]?)?|\|)*)

1 reference

reference URL

https://stackoverflow.com/questions/172303/is-there-a-regular-expression-to-detect-a-valid-regular-expression/172316#172316

retrieved

3 September 2016

Q21510851 (Deleted Item)

property

syntax clarification

regular expression syntax

country

reason for deprecated rank

reason for preferred rank

has quality

constraint clarification

0 references

Q21502404 (Deleted Item)

format as a regular expression

.+

constraint status

Q21502408 (Deleted Item)

0 references

Q52004125 (Deleted Item)

item of property constraint

Q29934200 (Deleted Item)

Q29934218 (Deleted Item)

0 references

Q21503250 (Deleted Item)

class

Q6545185 (Deleted Item)

Q19847637 (Deleted Item)

Q108566342 (Deleted Item)

Q18610173 (Deleted Item)

relation

Q30208840 (Deleted Item)

0 references

Q53869507 (Deleted Item)

property scope

Q54828448 (Deleted Item)

Q54828449 (Deleted Item)

0 references

maintained by WikiProject

Q56162322 (Deleted Item)

0 references

described at URL

https://www.pcre.org/current/doc/html/

language of work or name

Q1860 (Deleted Item)

0 references

related properties

regular expression syntax

0 references

format as language specific regular expression

0 references

syntax clarification

0 references

applies if regular expression matches

0 references

Smithsonian trinomial format regex

0 references

search formatter URL

no value

0 references

stability of property value

Q24025284 (Deleted Item)

0 references

Wikidata usage instructions

When used in property constraint, it should contain PCRE2 regular expression, treated as "full match". For example, "(?i)[a-z]+|\d+|" means that validated string should match /^(?:[a-z]+|\d+)$/i or be set to "no value" or "unknown value" (English)

0 references