CODEWITHSUNDEEP
javascriptregex
shreya gupta
shreya gupta

Reputation: 141

Regex not working for comma separated list of strings

I need a regex for following values:

Ha2:123hD,Ha2:123hD,Ha2:123hD - correct match - true
Ha2:123hD,Ha2:123hD,Ha2:123hD,  - comma on end - false
Ha2:123hD,Ha2:123hD,Ha2:123hD,,Ha2:123hD - double comma- false
,Ha2:123hD,Ha2:123hD,Ha2:123hD - comma at start- false

I am trying the following regex:

/(([a-zA-Z0-9]+)(\W)([a-zA-Z0-9]+))/
/(([a-zA-Z0-9]+)(\W)([a-zA-Z0-9]+,)*([a-zA-Z0-9]+)(\W)([a-zA-Z0-9])+$)/

But it is not working.

Upvotes: 1

Views: 771

Answers (3)

LukStorms
LukStorms

Reputation: 29647

You could put the comma at the start of the repeating group.

/^[a-zA-Z0-9]+[:][a-zA-Z0-9]+(?:,[a-zA-Z0-9]+[:][a-zA-Z0-9]+)*$/

Upvotes: 1

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626845

To only match comma-seaprated alphanumeric + : string lists you may use

/^[a-zA-Z0-9:]+(?:,[a-zA-Z0-9:]+)*$/

See the regex demo

Explanation:

  • ^ - start of string anchor
  • [a-zA-Z0-9]+ - a character class matching 1 or more (due to + quantifier) ASCII letters or digits or :
  • (?: - start of a non-capturing group....
    • , - a comma
    • [a-zA-Z0-9:]+ - a character class matching 1 or more (due to + quantifier) ASCII letters or digits or :
  • )* - .... 0 or more occurrences (due to the * quantifier)
  • $ - end of string.

Upvotes: 0

Herr Derb
Herr Derb

Reputation: 5357

If you only need to check for these fix strings (As I have to guess from your question), this will work ^(Ha2:123hD,)*Ha2:123hD$

And otherwise, you just can follow this expression and replace the Ha2:123hD with your wildcard expression.

Also check this website: https://regex101.com/ It explains nicely how the single symbols of a regex work.

Upvotes: 0

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