Pattern to identify digits from 0 to 9 along with specific symbols

Question

Pattern to identify digits from 0 to 9 along with specific symbols

I am currently in the process of creating a regular expression that can match 0 to 9 (up to 10 digits) and /-. (0 to 2 max), without having to be all . or all //. It can be /.\- or .-. or any combination of the three, with a maximum of two of those characters.

My goal is to verify if a date is in specified formats. The user has the option to input 1 or 10.02, etc. I will separate that value and utilize it later on.

How can I construct the regex for this? The task is being carried out in Javascript.

I attempted var pattern =/^([0-9([\/.-]{0,2})]{1,10})$/g; before ultimately giving up.

Edit: 1 -> true 10.10 - true 10.12/2020 - true / -> false .10.20 - false

javascript regex

Answer 1

Answer №1

If you need to match a specific pattern in your text, you can use quantifiers like {0,2} to capture certain groups of characters.

To ensure that you only match up to 10 digits and not more, you can implement a negative lookahead in your regex expression.

For a maximum of 0 - 3 occurrences, you can adjust the quantifier accordingly to {0,3}

^(?!(?:[0-9\/.-]*[0-9]){11}$)[0-9]+(?:[\/.-][0-9]+){0,2}$

Check out this Regex demo for further clarification.

const samplePattern = /^(?!(?:[0-9\/.-]*[0-9]){11}$)[0-9]+(?:[\/.-][0-9]+){0,2}$/;

[
  "1",
  "10.02",
  "1111111111",
  "111.111.1111",
  "10.12/2020",
  "/",
  ".10.20",
  "11111111111",
  "111.111.11111"
].forEach(str => console.log(str + " --> " + samplePattern.test(str)));

Answer 2

If you need to match a specific pattern in your text, you can use quantifiers like {0,2} to capture certain groups of characters.

To ensure that you only match up to 10 digits and not more, you can implement a negative lookahead in your regex expression.

For a maximum of 0 - 3 occurrences, you can adjust the quantifier accordingly to {0,3}

^(?!(?:[0-9\/.-]*[0-9]){11}$)[0-9]+(?:[\/.-][0-9]+){0,2}$

Check out this Regex demo for further clarification.

const samplePattern = /^(?!(?:[0-9\/.-]*[0-9]){11}$)[0-9]+(?:[\/.-][0-9]+){0,2}$/;

[
  "1",
  "10.02",
  "1111111111",
  "111.111.1111",
  "10.12/2020",
  "/",
  ".10.20",
  "11111111111",
  "111.111.11111"
].forEach(str => console.log(str + " --> " + samplePattern.test(str)));

Pattern to identify digits from 0 to 9 along with specific symbols

Answer №1

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