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Preg match to validate only numbers integer or decimals with sign + or -

Preg match to validate only whole numbers or decimals with sign + or -

How can I create a preg_match that only accepts decimal numbers which can have (or have no) + or - just when the number starts?

I put the following examples:

5 true

4.4 true

+5 true

+4.4 true

-5 true

-4.4 true

4.4- false

4.4+ false

For now I have a preg_match function that allows me to achieve this, but the problem is that I can enter the signs (. + -) in any part of the number, and I just need the signs (+ -) to be at the beginning and the point if it is decimal.

preg_match('/^[0-9.+]+$/', $value)


Thanks friends.

/^[+-]?d*.?d+$/

1 Answer
1

Converting my comment to answer.

You may use this regex for making + or - optional at the start.

+

-

^[+-]?d*.?d+$


RegEx Demo

Regex Explanation:

^

[+-]?

+

-

d*.?d+

$

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