spicy angularjs regex

Question

I've been working on a regex problem for angularJs ng-pattern which needs:

Cannot be blanks
A minimum of 1 character and a maximum of 32 characters
Spaces ONLY are not allowed
Acceptable special characters(!@#$%&*-+=[]:;',.? )
The answer is not case sensitive
Combination of &# is not allowed
Spaces at the beginning and the end of the answer should be trimmed.

This is my solution which covers all requirement but 6th:

([^a-zA-Z0-9!@#$%& *+=[\]:;',.?-])|(^\s*$)

Do you guys have any ideas?

Can you explain what "5. The answer is not case sensitive" means? — Robo Mop
– Robo Mop, Commented Apr 29, 2018 at 18:11
I think you need /^(?!\s*$)(?:(?!&#)[a-zA-Z0-9!@#$%&*+=[\]:;',.?\s-]){1,32}$/. However, I have no idea what your Req. 7 means. ng-pattern does not trim input text. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 29, 2018 at 18:18
the only one that I couldn't figure out is #6 req. I can do 'string'.trim() to handle #7. And for #5, a-zA-Z covers that. — user1070111
– user1070111, Commented Apr 29, 2018 at 19:39
Ok, did you try my suggestion? See regex101.com/r/AuTmSj/1. It can also be ^(?!\s*$)(?!.*&#)[a-zA-Z0-9!@#$%&*+=[\]:;',.?\s-]{1,32}$ — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 29, 2018 at 20:00
Omg, that works great. Thank you, Wiktor. So, put the ?! at the beginning means to match the negate? — user1070111
– user1070111, Commented Apr 29, 2018 at 21:07

Wiktor Stribiżew · Accepted Answer · 2018-04-29 23:49:06Z

1

You may use

/^(?!\s*$)(?!.*&#)[a-zA-Z0-9!@#$%&*+=[\]:;',.?\s-]{1,32}$/

See the regex demo.

Details

^ - start of string
(?!\s*$) - no 0+ whitespaces from start till end of string allowed
(?!.*&#) - no &# allowed after any 0+ chars
[a-zA-Z0-9!@#$%&*+=[\]:;',.?\s-]{1,32} - 1 to 32 allowed chars: ASCII digits, letters, whitespaces and some punctuation/symbols
$ - end of string.

answered Apr 29, 2018 at 23:49

Wiktor Stribiżew

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3 Comments

user1070111 Over a year ago

Hey Wiktor, thanks for the help, just one more question. what about the #& combination? now, the &# combination is working now, but I tried to add another group of (?!#&), but it didn't work.

user1070111 Over a year ago

figure it out. /^(?!\s*$)(?:(?!&#|#&)[a-zA-Z0-9!@#$%&*+=[]:;’,.?\s-])+$/, there you go.

Wiktor Stribiżew Over a year ago

@user1070111 Or /^(?!\s*$)(?!.*#&)(?!.*&#)[a-zA-Z0-9!@#$%&*+=[\]:;',.?\s-]{1,32}$/

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