CODEWITHSUNDEEP
javascriptregex
Roshan Patil
Roshan Patil

Reputation: 196

Need regex for range values

Need regex for following combination.

i tried below regex which accept number, two decimal no and should not end with <>=. special characters.

/^(?!.*<>=.$)[0-9]+(\.[0-9]{1,2})?$/gm

Need regex for range values

Upvotes: 0

Views: 235

Answers (2)

The fourth bird
The fourth bird

Reputation: 163632

You could match either a single occurrence of a number preceded by a combination of <>= or match 2 numbers with a hyphen in between.

^(?:(?:[<>]=?)?\d+(?:\.\d{1,2})?|\d+(?:\.\d{1,2})?-\d+(?:\.\d{1,2})?)$
  • ^ Start of string
  • (?: Non capture group for the alternation
    • (?:[<>]=?)? Optionally match < > <= >=
    • \d+(?:\.\d{1,2})? Match 1+ digits with optional decimal part of 1-2 digits
    • | Or
    • \d+(?:\.\d{1,2})?-\d+(?:\.\d{1,2})? Match a digits format with a hyphen in between
  • ) Close group
  • $ End of string

See a regex demo

const pattern = /^(?:(?:[<>]=?)?\d+(?:\.\d{1,2})?|\d+(?:\.\d{1,2})?-\d+(?:\.\d{1,2})?)$/;
[
  "5",
  "8.95",
  ">2.5",
  "<5.65",
  ">=4.24",
  "<=7.2",
  "1.2-3.2",
  "1-1.3",
  "1-4",
  ">2",
  ">=4",
  "2.5>",
  "1.123"
].forEach(s => console.log(`${s} ==> ${pattern.test(s)}`));

Upvotes: 1

Peter Thoeny
Peter Thoeny

Reputation: 7616

This regex does what you ask for. The test has first some matches, followed by non-matches:

const regex = /^(([><]=?)?[0-9]+(\.[0-9]{1,2})?|[0-9]+(\.[0-9]{1,2})?-[0-9]+(\.[0-9]{1,2})?)$/;
[
  '1',
  '12',
  '12.2',
  '12.34',
  '>1.2',
  '>=1.2',
  '<1.2',
  '<=1.2',
  '1.2-3.4',
  '1.22-3.44',
  'x1',
  '1.234',
  '1.222-3.444'
].forEach((str) => {
  let result = regex.test(str);
  console.log(str + ' ==> ' + result)
})

Output:

1 ==> true
12 ==> true
12.2 ==> true
12.34 ==> true
>1.2 ==> true
>=1.2 ==> true
<1.2 ==> true
<=1.2 ==> true
1.2-3.4 ==> true
1.22-3.44 ==> true
x1 ==> false
1.234 ==> false
1.222-3.444 ==> false

Upvotes: 1

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