如何编写正则表达式模式以匹配 php 中的以下模式？

Question

I am taking the value from the user it may contains the following patterns

123.00,12.00,1.00,134564.00,123457685.00

before Dot it must be varying length minimum one digit to upto 9 digits and after dot it will contain only two ZERO'S .please help me to write the pattern..?

//$pattern must follow above critera
$chk=preg_match($pattern,$request->amount);
if($chk){
  //My logic if it's matches the pattern
}

Answer 1

You may use

^-?\d{1,9}(?:\.00)?$

See a demo on regex101.com . This will allow sth. like -100 , -100.00 but not eg 100.11 .

Answer 2

<?php

// regex version
$request = "123.00,12.00,1.00,134564.00,123457685.00";
$pattern = "/[0-9]{1,9}\.00/";
preg_match_all($pattern,$request, $matches);
print_r($matches);

// simpler version
$values = explode(',', $request);
print_r($values);