21 февр. 2011 г. · This regex pattern will match an empty string: ^$ And this will match (crudely) an email or an empty string: (^$|^.*@.*\..*$)

1 окт. 2013 г. · In other words, to exclusively match an empty string, you need to use /\A\z/ . ^$ -- regex to accept empty string. And it wont match "/n" or " ...

4 сент. 2016 г. · Consider StringUtils.isBlank() before matching by regex. It checks if input is null, or an empty string, or has only whitespaces.

16 окт. 2016 г. · I have some regex that tests against if the string has at least 6 characters. Though I also want it to be true if there is just an empty string also.

21 июн. 2010 г. · Is it possible to use a regular expression to detect anything that is NOT an "empty string" like this: string s1 = ""; string s2 = " "; string s3 = " "; string ...

11 сент. 2019 г. · I have a Python script in which I'm trying to parse a string of the form: one[two=three].four Each word should be in its own capture group. The punctuation ...

1 окт. 2013 г. · If you are looking for empty string in addition to whitespace you meed to use * rather than + var regex = /^\s*$/ ; ^

27 янв. 2020 г. · Need help coming up with a regex that only allows numbers, letters, empty string, or spaces. ^[_A-z0-9]*((-|\s)*[_A-z0-9])*$

12 июл. 2013 г. · Whether ^\s*$ matches an empty string depends on your definition of "empty". Like ^$ , it will match the completely empty string .

27 окт. 2014 г. · The * returns a blank string because, * means that matching 0 or more characters. While using + means that there should be at least 1 character appended to the ...