Using JavaScript and TypeScript to create a regular expression that meets three different conditions

Question

Using JavaScript and TypeScript to create a regular expression that meets three different conditions

I need assistance validating a specific element in an XML document using regular expressions.

<ConfigOption>value</ConfigOption>

Here are the requirements for ConfigOption:

Allowed characters include letters, numbers, underscores, and spaces.
The format CONFIG-XX is acceptable, where XX represents numbers.
The format CONFIGNAME?config=XX is also permitted, with XX being numbers.

This is the regular expression I have so far:

(^[a-zA-Z0-9 _]*$)|(?:\??config=\d)|(^CONFIG\-\d$)

For example:

'hello' should pass validation.
'hello?config=20' should pass validation.
'CONFIG-20' should pass validation.
'hello-' should fail validation.
'hello*' should fail validation.

Can someone help me correct my regular expression? Even after testing 'hello=' or 'hello*' on 'https://regex101.com/', it still matches.

javascript typescript

Answer 1

Answer №1

After careful consideration, I believe this solution aligns perfectly with your specified criteria. Please share any feedback for further refinement.

An important addition lies in incorporating the lookahead (?=\W).

It is worth noting that the third condition appears to be unnecessary and redundant.

const regex = /(?=\W)(^\b[a-zA-Z0-9 _]*)|(^[a-zA-Z0-9 _]*(?:\??[Cc][Oo][Nn][Ff][Ii][Gg][=,-]\d{2}))/;
const tests = ['*HELLO', 'hello', 'hello=', 'hello*', 'hello?CONFIG-20', 'hello?CONFIG=20', 'config=20'];

for (const test of tests) {
  console.log(regex.test(test));
}

Answer 2

After careful consideration, I believe this solution aligns perfectly with your specified criteria. Please share any feedback for further refinement.

An important addition lies in incorporating the lookahead (?=\W).

It is worth noting that the third condition appears to be unnecessary and redundant.

const regex = /(?=\W)(^\b[a-zA-Z0-9 _]*)|(^[a-zA-Z0-9 _]*(?:\??[Cc][Oo][Nn][Ff][Ii][Gg][=,-]\d{2}))/;
const tests = ['*HELLO', 'hello', 'hello=', 'hello*', 'hello?CONFIG-20', 'hello?CONFIG=20', 'config=20'];

for (const test of tests) {
  console.log(regex.test(test));
}

Using JavaScript and TypeScript to create a regular expression that meets three different conditions

Answer №1

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