正则表达式匹配超过 18 位的经度值

Question

I want to match longitude value: -3.6503552000000004 using preg_match('/^([+\-])?(?:180(?:(?:\.0{1,6})?)|(?:[0-9]|[1-9][0-9]|1[0-7][0-9])(?:(?:\.[0-9]{1,6})?))$/', $value) but seems my regex can't validate if more than 15 digits behind the dot.

Here the test I did that passed:

<?php

namespace Tests\Unit\Rules;

use App\Rules\LongitudeRule;
use Tests\TestCase;

class LongitudeRuleTest extends TestCase
{
    /** @test */
    public function pass_when_value_between_min_180_to_plus_180()
    {
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-180'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '+180'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-45'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '+45'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '0'));
    }

    /** @test */
    public function pass_when_value_between_min_180_to_plus_180_and_float()
    {
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-180.0'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '+180.0'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-45.1'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '+45.1'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '0.0'));
    }

    /** @test */
    public function pass_when_value_between_min_180_to_plus_180_and_no_plus_assigned()
    {
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-180'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '180.0'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '-45.1'));
        $this->assertTrue((new LongitudeRule)->passes('longitude', '45'));
    }

    /** @test */
    public function failed_when_value_has_using_comma()
    {
        $this->assertFalse((new LongitudeRule)->passes('longitude', '45,1'));
        $this->assertFalse((new LongitudeRule)->passes('longitude', '-45,1'));
    }

    /** @test */
    public function failed_when_value_is_wrong()
    {
        $this->assertFalse((new LongitudeRule)->passes('longitude', 'A'));
    }
}

I'm new at regex sorry. So.? I do want to say thanks if someone can help?

Answer 1

(?:\.[0-9]{1,6})? can't match 15 digits as it can only match 1 through 6 digits after a dot. So.. need to increase the limit (?:\.[0-9]{1,16})? or remove the limit (?:\.[0-9]+)?

Thank you @WiktorStribiżew @Rokas