CODEWITHSUNDEEP
javaregex
Noah Iarrobino
Noah Iarrobino

Reputation: 1543

Match only Upper and Lowercase letters with Regex

I am given a string (name) and it is supposed to check for the following:

here is my regex string: "[[[A-Z]{1}[a-zA-Z]*[\\s]?+]{2,30}[^\\s]"

"Roger Federer" should be valid, and this says it is "Roger federer" should NOT be valid, but mine says it is "Roger Federer $" should NOT be valid, but mine says it is

I'm curious if I'm enforcing these wrong, I am very new to regex

Upvotes: 1

Views: 1483

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626799

You can use

^(?=.{2,30}$)\p{Lu}\p{L}*(?:\s\p{Lu}\p{L}*)*$

If you want to allow one or more whitespaces between words, add + after \s.

See the regex demo.

In Java, the regex declaration will look like

s.matches("(?=.{2,30}$)\\p{Lu}\\p{L}*(?:\\s\\p{Lu}\\p{L}*)*")

The pattern matches

  • ^ - (implicit in matches) - start of string
  • (?=.{2,30}$) - two to thirty chars required in the whole string
  • \p{Lu}\p{L}* - an uppercase letter followed with zero or more letters
  • (?:\s\p{Lu}\p{L}*)* - zero or more occurrences of a whitespace, then an uppercase letter and then zero or more letters
  • $ - (implicit in matches) - end of string.

If you want to only match ASCII letters, replace \p{Lu} with [A-Z] and \p{L} with [A-Za-z].

Upvotes: 1

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