I am working on a Swift project and I need to use this regex to check email is valid or not but when the app start the checking the app crash and give me this error:
NSInternalInconsistencyException', reason: 'Can't do regex matching, reason: Can't open pattern U_REGEX_MISSING_CLOSE_BRACKET
This is my REGEX:
^(([^<>()[\\]\\.,;:\\s@\\\"]+(\\.[^<>()[\\]\\.,;:\\s@\\\"]+)*)|(\\\".+\\\"))@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+[\\.]*)+[a-zA-Z]{2,}))$
Check unescaped brackets in your regex pattern:
let pattern
= "^(([^<>()[\\]\\.,;:\\s@\\\"]+(\\.[^<>()[\\]\\.,;:\\s@\\\"]+)*)|(\\\".+\\\"))"
// [ [ ] [ [ ]
+ "@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+[\\.]*)+[a-zA-Z]{2,}))$"
// [ ] [ ] [ ] [ ] [ ] [ ] [ ]
You have some mismatching brackets [ ] in the first half of your pattern.
In some dialects of regex, you have no need to escape [ between [ and ], but in some other dialects, you need it.
Try adding some escapes to your regex:
let pattern
= "^(([^<>()\\[\\]\\.,;:\\s@\\\"]+(\\.[^<>()\\[\\]\\.,;:\\s@\\\"]+)*)|(\\\".+\\\"))"
// [ ^^ ] [ ^^ ]
+ "@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+[\\.]*)+[a-zA-Z]{2,}))$"
// [ ] [ ] [ ] [ ] [ ] [ ] [ ]
[and]inside a character class, use"^(([^<>()\\[\\],;:\\s@\"]+(\\.[^<>()\\[\\],;:\\s@\"]+)*)|(\".+\"))@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z0-9-]+[.]*)+[a-zA-Z]{2,}))$"