Verification Tool for Detecting Repeated Spaces

I am working towards developing an Angular Validator that will prevent consecutive spaces from being entered.

At the moment, I have implemented 

Validators.pattern('^[a-zA-Z0-9]+( [a-zA-Z0-9]+)*$')
, which successfully addressed the issue. However, it inadvertently restricts special characters, which is not desirable.

  • text text should not be considered valid due to multiple consecutive spaces
  • The validator should also account for cases where spaces are at the beginning or end of the string
  • text α should not trigger an error even though α is a special character
regexangulartypescriptangular6

Answer №1

Feel free to utilize

Validators.pattern('\\d{3}-\\d{2}-\\d{4}') // if there is a specific format of digits
Validators.pattern('\\d{3}-\\d{2}|\\d{4}') // if there are two different formats of digits possible

Alternatively, use the regex literal form:

Validators.pattern(/^\d{3}-\d{2}-\d{4}$/) // if there is a specific format of digits
Validators.pattern(/^\d{3}-\d{2}|\d{4}$/) // if there are two different formats of digits possible

This will be interpreted as

  • ^ - beginning of line (implicitly included in string patterns)
  • \d{3} - 3 digits
  • - - hyphen
  • \d{2} - 2 digits
  • (?: \S+)* - 0 or more repetitions of a space followed with 1+ non-whitespace chars
  • $ - end of line (implicitly included in string patterns).

If any whitespace is allowed between digit chunks, substitute the literal space with \s (or \\s) in the patterns.

Answer №2

For your matching needs, consider using the pattern \s*([^\s]+\s?)*\s*.

This translates to: zero or more spaces followed by a combination of one or more non-space characters and optional space, all surrounded by zero or more spaces.

To see it in action, check out this link: https://stackblitz.com/edit/angular-abc123

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