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Javascript equivalent of Java Regex

A Gilani Published at Dev
9
A Gilani

I am trying to write a javascript REGEX to validate a string.

It should validate to the requirement which is as follow.

it should have only Uppercase and lowercase English letters (a to z, A to Z) (ASCII: 65 to 90, 97 to 122) AND/OR Digits 0 to 9 (ASCII: 48 to 57) AND Characters - _ ~ (ASCII: 45, 95, 126). Provided that they are not the first or last character. It can also have Character. (dot, period, full stop) (ASCII: 46) Provided that it is not the first or last character, and provided also that it does not appear two or more times consecutively.

I have a Java version of the REGEX as following.

^(?=[^\W_])[\w~-]++(\.[\w*~-]++)*+(?<=[^\W_])$

And unsuccessfully trying to convert it be used with Javascript. Below is my failed attempt.

^(?=[^\W_])[\w~-]+(.[\w~-]+)(.[\w])$

it fails on the follow two tests

abc..def 1

Test cases for invalid strings:

"a." "1." "a1." "aB78." "aB78..ab" "aB78,1" "aB78 abc" ".Abc12"

Test cases for valid strings:

"a" "1" "a1" "a.1" "abc-def" "a1b2c~3" "012_345"

Jan

Based on your requirements, you could come up with:

^(?!.*\.{2})(?=.*[a-zA-Z0-9]$)[a-zA-Z0-9][-~.\w]*$

In multiline mode, see a demo on regex101.com.

Explanation:

  • ^ assure it's the beginning of the line
  • (?!.*.{2,}) negative lookahead - no two dots consecutively
  • (?=.*[a-zA-Z0-9]$) the last character needs to be one of these
  • [a-zA-Z0-9] first character needs to be one of these
  • [-~.\w]* anything of these afterwards (zero or more times)
  • $ assure the string ends here

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