JS: Extracting specific text from a string

Question

I have a string like this ...

var str = "6 validation errors detected: Value '' at 'confirmationCode' failed to satisfy constraint: Member must satisfy regular expression pattern: [\S]+; Value '' at 'confirmationCode' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'password' failed to satisfy constraint: Member must satisfy regular expression pattern: [\S]+; Value at 'password' failed to satisfy constraint: Member must have length greater than or equal to 6; Value at 'username' failed to satisfy constraint: Member must satisfy regular expression pattern: [\p{L}\p{M}\p{S}\p{N}\p{P}]+; Value at 'username' failed to satisfy constraint: Member must have length greater than or equal to 1";

I want to extract all the "unique" lines that start with the word ... "Value" ...

So expected output is ...

Value '' at 'confirmationCode' failed to satisfy constraint
Value at 'password' failed to satisfy constraint
Value at 'username' failed to satisfy constraint

Here is what I have tried so far ...

var x = str.split("\;|\:")  // This is NOT working
console.log(x);

var z = y.filter(word => word.indexOf("Value") > -1) // Also this needs to be tweaked to filter unique values
console.log(z);

Performance is an issue, so I prefer the most optimized solution.

CertainPerformance · Accepted Answer · 2018-06-18 07:40:49Z

3

You might use a single regular expression, no split or filter or loops or other tests needed:

var str = "6 validation errors detected: Value '' at 'confirmationCode' failed to satisfy constraint: Member must satisfy regular expression pattern: [\S]+; Value '' at 'confirmationCode' failed to satisfy constraint: Member must have length greater than or equal to 1; Value at 'password' failed to satisfy constraint: Member must satisfy regular expression pattern: [\S]+; Value at 'password' failed to satisfy constraint: Member must have length greater than or equal to 6; Value at 'username' failed to satisfy constraint: Member must satisfy regular expression pattern: [\p{L}\p{M}\p{S}\p{N}\p{P}]+; Value at 'username' failed to satisfy constraint: Member must have length greater than or equal to 1";

console.log(
  str.match(/((^|Value)[^:]+)(?!.*\1)/g)
);

edited Jun 18, 2018 at 7:40

answered Jun 18, 2018 at 7:22

CertainPerformance

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2 Comments

Slyper Over a year ago

Is it possible to also get the opening line "6 validation errors detected" along with the "value" lines ?

CertainPerformance Over a year ago

See edit, just match the beginning of the string or Value

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