CODEWITHSUNDEEP
javascriptregex
rubyist
rubyist

Reputation: 3132

regular expression to match name with only one spaces

I have a string condition in js where i have to check whether name entered in text box contains with one space only. 

 pattern: name.status === 'full_name' ? /^[a-zA-Z.+-.']+\s+[a-zA-Z.+-. ']+$/ : /^[a-zA-Z.+-. ']+$/

But the above regex matches names ending with 2 spaces also.

I need to match it such that the entered name should accept only one space for a name string. So the name will have only one space in between or at the end.

Upvotes: 1

Views: 3583

Answers (3)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626870

Two observations: 1) \s+ in your pattern matches 1 or more whitespaces, and 2) [+-.] matches 4 chars: +, ,, - and ., it is thus best to put the hyphen at the end of the character class.

You may use

/^[a-zA-Z.+'-]+(?:\s[a-zA-Z.+'-]+)*\s?$/

See the regex demo

Details

  • ^ - start of string
  • [a-zA-Z.+'-]+ - 1 or more letters, ., +, ' or -
  • (?:\s[a-zA-Z.+'-]+)* - zero or more sequences of:
    • \s - a single whitespace
    • [a-zA-Z.+'-]+ - 1 or more letters, ., +, ' or - chars
  • \s? - an optional whitespace
  • $ - end of string.

Note: if the "names" cannot contain . and +, just remove these symbols from your character classes.

Upvotes: 1

Hitmands
Hitmands

Reputation: 14179

you could also use word boundaries...

function isFullName(s) {
  
  return /^\b\w+\b \b\w+\b$/.test(s);
}



['Giuseppe', 'Mandato', 'Giuseppe Mandato']
  .forEach(item => console.log(`isFullName ${item} ? ${isFullName(item)}`))

Upvotes: 0

ysurilov
ysurilov

Reputation: 300

/^\S+\s\S+$/

try this

Some explanations:

  • ^ - start of string
  • \s - single whitespace
  • \S - everything except whitespace
  • "+"- quantifier "one or more"
  • $ - end of string

Upvotes: 0

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