PHP regular expression to verify numbers_PHP tutorial

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php tutorial regular expression verification number

Non-negative floating point number (positive floating point number + 0): ^d+(.d+)?$
Positive floating point number ^(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]* .[0-9]+)|([0-9]*[1-9][0-9]*))$
Non-positive floating point number (negative floating point number + 0) ^((-d+(.d+)?)|(0+(.0+)?))$
Negative floating point number ^(-(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9 ]*.[0-9]+)|([0-9]*[1-9][0-9]*)))$
Floating point number ^(-?d+)(.d+)?

^[1-9]d*$　 ​​

//Match positive integers

^-[1-9]d*$ 　

//Match negative integers

^-?[1-9]d*$

//Match integers

^[1-9]d*|0$　

//Match non-negative integers (positive integers + 0)

^-[1-9]d*|0$

//Match non-positive integers (negative integers + 0)

^[1-9]d*.d*|0.d*[1-9]d*$　 ​​

//Match positive floating point numbers

^-([1-9]d*.d*|0.d*[1-9]d*)$　

//Match negative floating point numbers

^-?([1-9]d*.d*|0.d*[1-9]d*|0?.0+|0)$　

//Match floating point numbers

^[1-9]d*.d*|0.d*[1-9]d*|0?.0+|0$　

// Match non-negative floating point numbers (positive floating point numbers + 0)

^(-([1-9]d*.d*|0.d*[1-9]d*))|0?.0+|0$　

// Match non-positive floating point numbers (negative floating point numbers + 0)

Verification number: ^[0-9]*$
Verify n-digit number: ^d{n}$
Verify at least n digits: ^d{n,}$
Verify m-n digit number: ^d{m,n}$
Verify numbers starting with zero and non-zero: ^(0|[1-9][0-9]*)$
Verify a positive real number with two decimal places: ^[0-9]+(.[0-9]{2})?$
Verify positive real numbers with 1-3 decimal places: ^[0-9]+(.[0-9]{1,3})?$
Verify non-zero positive integers: ^+?[1-9][0-9]*$
Verify non-zero negative integers: ^-[1-9][0-9]*$
Verify non-negative integer (positive integer + 0) ^d+$
Verify non-positive integers (negative integers + 0) ^((-d+)|(0+))$
Validate characters of length 3: ^.{3}$

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