Regular expression that disallows names that end in anything other than letters, except for a dot

Question

Regular expression that disallows names that end in anything other than letters, except for a dot

I've developed a regex pattern that validates whether a given text is a valid first or last name, returning either true or false:

let letters = `a-zA-Z`;
  letters += `àáâäãåąčćęèéêëėįìíîïłńòóôöõøùúûüųūÿýżźñçčšž`;
  letters += `ÀÁÂÄÃÅĄĆČĖĘÈÉÊËÌÍÎÏĮŁŃÒÓÔÖÕØÙÚÛÜŲŪŸÝŻŹÑßÇŒÆČŠŽ∂ð`;
  const re = new RegExp(`^[$letters][${letters} ,.'’-]+[${letters}.]`, 'u')
  return(name.match(re));

Although it currently verifies names beginning with a letter and excluding numerals or most special characters except dot, hyphen, or comma, issues arise with short names like Jo or Xi. I understand this is due to the separate blocks in my current setup. How can I adjust the expression to address this issue?

Furthermore, is there a way to concisely condense this without compromising its functionality while still accommodating extended Latin characters?

javascript regex

Answer 1

Answer №1

To ensure that a word has a minimum length of 2 characters, you can implement a negative lookahead ^(?!.*[ ,'’]$) to confirm that the string does not conclude with prohibited characters. You can then omit the final [${letters}.]

Check out the regex demo here

If the minimum required length is just 1 character, you may utilize another negative lookahead (?![ .,'’]) along with including the dot in this instance as well. This ensures that a single dot cannot be present at the beginning. You can then apply a character class encompassing all acceptable characters.

^(?!.*[ ,'’]$)(?![ .,'’])[a-zA-ZàáâäãåąčćęèéêëėįìíîïłńòóôöõøùúûüųūÿýżźñçčšžÀÁÂÄÃÅĄĆČĖĘÈÉÊËÌÍÎÏĮŁŃÒÓÔÖÕØÙÚÛÜŲŪŸÝŻŹÑßÇŒÆČŠŽ∂ð ,.'’-]+$

Explore the regex demo for further clarification

Answer 2

To ensure that a word has a minimum length of 2 characters, you can implement a negative lookahead ^(?!.*[ ,'’]$) to confirm that the string does not conclude with prohibited characters. You can then omit the final [${letters}.]

Check out the regex demo here

If the minimum required length is just 1 character, you may utilize another negative lookahead (?![ .,'’]) along with including the dot in this instance as well. This ensures that a single dot cannot be present at the beginning. You can then apply a character class encompassing all acceptable characters.

^(?!.*[ ,'’]$)(?![ .,'’])[a-zA-ZàáâäãåąčćęèéêëėįìíîïłńòóôöõøùúûüųūÿýżźñçčšžÀÁÂÄÃÅĄĆČĖĘÈÉÊËÌÍÎÏĮŁŃÒÓÔÖÕØÙÚÛÜŲŪŸÝŻŹÑßÇŒÆČŠŽ∂ð ,.'’-]+$

Explore the regex demo for further clarification

Regular expression that disallows names that end in anything other than letters, except for a dot

Answer №1

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