Regex for String in React

Question

How shall we write a regular expression to validate a string that should have a length of a minimum of 1 character and a maximum of 50 characters, have both upper case and lower case, alphanumeric, include space, and have mostly used special characters like @,._-&$#? The first character should be either alphabet or number then the rest can be as mentioned above.

*If it is only one character then it should be an alphanumeric one

I have tried a regex with my limited knowledge which looks like

^[a-zA-z]*[a-zA-Z\d\-_@&$%#\s]{1,50}$

But I am not able to match the string if there is only one character given, can anyone guide me to fix this

Can Include 1 or more spaces but the begining of the text should be an alphabet @alextrastero — Christine Shaji
– Christine Shaji, Commented Oct 27, 2020 at 12:44
Thanks for the reference, I will check that as well @WiktorStribiżew — Christine Shaji
– Christine Shaji, Commented Oct 27, 2020 at 12:45
@WiktorStribiżew I have tried to create a regex with my limited knowledge and your reference and i have edited the question with that. can you help me fix this — Christine Shaji
– Christine Shaji, Commented Oct 27, 2020 at 15:25
Aha, so you want to use a Unicode-aware \w? See this answer, and you will need to use /^(?=\p{Alphabetic})[\p{Alphabetic}\p{Mark}\p{Decimal_Number}\p{Connector_Punctuation}\p{Join_Control}@,.&$%#\s-]{1,50}$/u — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Oct 27, 2020 at 15:43

Wiktor Stribiżew · Accepted Answer · 2020-10-28 16:56:02Z

2

You can use

/^(?=[\p{L}0-9])[\p{L}\p{N}_@,.&$%#\s-]{1,50}$/u

See the regex demo

Details

^ - start of string
(?=[\p{L}0-9]) - the first char must be a Unicode letter (\p{L}) or an ASCII digit
[\p{L}\p{N}_@,.&$%#\s-]{1,50} - one to fifty
- \p{L} - any Unicode letter
- \p{N} - any Unicode digit
- _@,.&$%#- - any of these chars
- \s - any whitespace
$ - end of string.

answered Oct 28, 2020 at 16:56

Wiktor Stribiżew

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