Run results for: JSON Parse vs regex

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
JSON	331716.4 Ops/sec
Regex	375041.6 Ops/sec
String search	645823.4 Ops/sec
indexOf	679686.1 Ops/sec

Script Preparation code:

var entries = [{
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":221}"
    },
    {
        "data": "random_string_one",
        "comment": "{\"random_other_field_one\":\"this is a bunch of sample data\",\"random_other_field_two\":\"this is another set of sample data\",\"random_other_field_three\":\"this is another bit of sample data\",\"random_other_field_four\":\"this is another glob of sample data\",\"segregationRequirement\":2}"
    }
];

Tests:

JSON
const arr = []; for (const entry of entries) { const value = JSON.parse(entry.comment); arr.push(value.segregationRequirement); }
Regex
const arr = []; const re = /"segregationRequirement":\s*(\d+)[,}]/; for (const entry of entries) { const match = entry.comment.match(re) arr.push(match[1]); }
String search
const arr = []; for (const entry of entries) { const found = entry.comment.includes('"segregationRequirement":2'); arr.push(found); }
indexOf
const arr = []; for (const entry of entries) { const found = entry.comment.indexOf('"segregationRequirement":2') !== -1; arr.push(found); }

Run results for: JSON Parse vs regex

JSON

Regex

String search

indexOf