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@DavidWells
Created March 14, 2022 01:46
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Regex match JSON Object keys
// via https://stackoverflow.com/questions/8750127/regex-for-parsing-single-key-values-out-of-json-in-javascript
const obj1 = {
id: 1,
'name.1': '123',
address: {
'address.1': 'Chicken Dinner Road, 69',
'address.2': 'Psycho lane, 666',
},
'age.1': {
'thisIsSomeCrazyJson.3': 10,
age: 50,
},
types: [
{
id: 22,
'name.name': '123',
typeOption: {
id: 1,
'whoTFWroteThisJSON.2': '123',
},
},
{
id: 32,
'name.1': '123',
},
],
};
const obj2 = {
Name: 'Humpty',
Age: '18',
Siblings: ['Dracula', 'Snow White', 'Merlin'],
Posts: [
{
Title: 'How I fell',
Comments: [
{
'User': 'Fairy God Mother',
'Comment': "Ha, can't say I didn't see it coming",
},
],
},
],
};
function matchKeyDeep(input, pattern) {
return Object.entries(input).reduce((nextInput, [key, value]) => {
const isMatch = pattern.test(key);
if (Array.isArray(value)) {
const arrValue = value;
let nextValue = arrValue.map((arrItem) => {
if (typeof arrItem === 'object') {
return matchKeyDeep(arrItem, pattern);
}
return arrItem;
});
if (!isMatch && Array.isArray(nextValue)) {
nextValue = nextValue.filter((v) => (typeof v === 'object' && v !== null));
if (nextValue.length === 0) return nextInput;
}
nextInput[key] = nextValue;
return nextInput;
}
if (typeof value === 'object') {
const recurse = matchKeyDeep(value, pattern);
if (!isMatch && Object.keys(recurse).length === 0) {
return nextInput;
}
nextInput[key] = recurse;
return nextInput;
}
if (isMatch) {
nextInput[key] = value;
}
return nextInput;
}, {});
}
const res = matchKeyDeep(obj1, /\.\d/);
const res2 = matchKeyDeep(obj2, /Comment/);
console.log(res);
console.log(res2);
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