Validate a string with a regex

Question

I need write regular expression which will handle below constraints:

Names can contain only letters, numbers, hyphens (-), dollar signs, brackets ([ , ]), and underscores (_). Single periods (.) are allowed only inside of an internal name (abc.de), not at the beginning or the end of an internal name (.abc or def.). Spaces and all other special characters not listed here are not supported.

I wrote something like this:

(^[^\.])([A-Za-z0-9\.\$\[\]\_\-])*[^.]

but still I can put one sign like: ! or @ or %

vks · Accepted Answer · 2015-04-09 18:17:25Z

1

^(?!\.)([A-Za-z0-9\.\$\[\]\_\-])+(?<!\.)$

You need anchors .Also [^\.] can accept anything other than ..So lookaheads and lookbehinds are advised.

See demo.

https://regex101.com/r/sJ9gM7/78

answered Apr 9, 2015 at 18:17

vks

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4 Comments

Jatuzo Over a year ago

almost fine, but now I can not put one char, and '.' (dot) is allowed on the end - shouldn't be

Jatuzo Over a year ago

previously looked better, when we use '+' then one character is not allowed. Code above not working.

vks Over a year ago

@Jatuzo for javascript use ^(?!\.)([A-Za-z0-9\.\$[]_\-])*[A-Za-z0-9\$[]_\-]$

Jatuzo Over a year ago

for now nothig allowed

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