How to do name validation allowing alphabet, spaces and dot in android?

Question

My code cannot enter dot. Can someone help me?

public boolean isValidLastName(final String lastname){
    Pattern pattern;
    Matcher matcher;
    final String LASTNAME_PATTERN = "[a-zA-Z]+\\.?";
    pattern = Pattern.compile(LASTNAME_PATTERN);
    matcher = pattern.matcher(lasname);
    return matcher.matches();
}

this link should be useful [ https://stackoverflow.com/a/3675027/5919568 ] — Morteza Jalambadani, Aug 18 '18 at 07:37

phye · Answer 1 · 2018-08-19T01:22:02.877

0

Dot should be placed inside brackets. Use this:

[ .a-zA-Z]+

You may also try \w\d in the brackets to replace , but I’m not sure if Java supports it.

edited Aug 19 '18 at 01:22

answered Aug 18 '18 at 07:45

phye

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Do you know lastnames that contain digits? – Toto Aug 18 '18 at 08:45
@Toto Oops, you’re right. Got incorrect understanding of “alphabet” – phye Aug 18 '18 at 11:11

20 fps · Accepted Answer · 2018-08-18T08:56:45.740

-1

Try using this one instead [a-zA-Z.\s]+ - allowing alphabet or dot or whitespaces.

edited Aug 18 '18 at 08:56

answered Aug 18 '18 at 07:39

20 fps

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Thanks it works! Ex: Adawiyah Abd. Jalil – Adda Aug 18 '18 at 07:51
@Adda we have very helpful resources in the internet, where you can check your expressions next time, so try for example https://regex101.com/ – 20 fps Aug 18 '18 at 07:54
3

Nice validation - it accepts all chars except digits and `_`. What good is it? – Wiktor Stribiżew Aug 18 '18 at 08:49
Your regex matches lots of things, e.g. [`§§§§§@$#%^*&)(*%$#@$@#!$#$#&§`](https://regex101.com/r/ZVGgZ7/1). – Wiktor Stribiżew Aug 18 '18 at 08:56
@WiktorStribiżew no, lol, check it. – 20 fps Aug 18 '18 at 08:57
1

@20fps Wiktor is correct. The `\W` already includes `.` (and everything `[^a-zA-Z0-9_]`), so using `.` is useless in that regex. That pattern is the equivalent of `[^\d_]`. Your updated pattern is better. – Makyen Aug 18 '18 at 08:59
@Makyen yes, but I corrected it already. – 20 fps Aug 18 '18 at 08:59
Thanks guys! I already change it and its works. – Adda Aug 18 '18 at 09:13

Stile · Answer 3 · 2018-08-18T08:01:43.217

-1

You shouldnt use double "\" like in java's String before special characters, instead just put dot in brackets. You can always check how your regular expression works https://www.regextester.com You can read more about regex Patterns in doc:https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html

edited Aug 18 '18 at 08:01

answered Aug 18 '18 at 07:55

Stile

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How to do name validation allowing alphabet, spaces and dot in android?

3 Answers3