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This article mainly introduces "how to write js regular expressions limited to 1-2 integers and at most two decimal places". In daily operation, it is believed that many people have doubts about how to write js regular expressions to 1-2 integers and at most two decimal places. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the question of "how to write js regular expressions limited to 1-2 integers and at most two decimal places"! Next, please follow the editor to study!

Test code

/ / 1. Only digits can be entered or decimal point is only integer, integer plus decimal var reg1=/ (^ [0-9] {1 true 2} [\.] {1} [0-9] {1 true 2} $) /; console.log (reg1.test (") +" empty string false "); console.log (reg1.test (" 1 ") +" 1 true "); console.log (reg1.test (" 10 ") +" 10 true ") Console.log (reg1.test ("10.") + "10. False"); console.log (reg1.test ("100.1") + "100 false"); console.log (reg1.test ("100.1") + "100.1 false"); console.log (reg1.test ("10.1") + "10.1 ture"); console.log (reg1.test ("10.101") + "10.10 true"); console.log (reg1.test ("10.101") + "10.101 false") Console.log (reg1.test ("0.101") + "0101 false"); console.log (reg1.test ("110.101") + "110.101 false"); console.log (reg1.test ("a") + "a false"); console.log (reg1.test ("*") + "* false"); console.log (reg1.test ("..") + ".. False ")

Effect picture

If you don't limit two-digit integers, such as at least 1-digit integer, [0-9] {1,} is fine.

Regular to or "|" in js

/ / must start with a number and end with a number, with a comma in the middle. If only one number can be the number var regx1=/ (^ [0-9] {1,} [0-9,] {0,} [0-9] {1,} $) | (^ [0-9] {1} $) /

The regular expression table matches all two digits, and the ten digits are 1

For example, if I want to match all the shapes such as param_tag=12, the equal sign is followed by two digits and ten digits are 1. I can use the following regular expression to match:

Parma_tag=\

Regular expression: matches two digits, and the first bit cannot be 0

^ [1-9] [0-9] $

Js regular, can only enter numbers and at least two significant digits, up to five digits (the limited number of digits can be adjusted by yourself)

Var reg=/ ^ [1-9]\ d {0Magne3}\.\ d$ | / ^ [1-9]\ d {0Magne2}\.\ d {2} $| ^ [1-9]\ d {1Magne4} $| ^ [0]\.\ d {2Magne4} $/

Code analysis:

Var reg = / ^ [1-9]\ d {0jue 3}\.\ dbath /; / first digit (1-9), middle zero to three digits, followed by period, one decimal place (0-9) var reg = / ^ [1-9]\ d {0jue 2}\.\ d {2} $/ / / the first place (1-9), the middle zero to two digits, followed by the period, the last two decimal places (0-9) var reg = / ^ [1-9]\ d {1pm 4} $/; / the first place (1-9), one to four digits from the middle to the end, no decimal var reg = / ^ [0]\.\ d {2pm 4} $/ / / the first place (0), followed by the period, followed by two to four decimal places (0-9) / / when written together, it is connected with the'| 'symbol, which means or, and any condition is met.

Js regular expressions-limit the length of numbers

For example, limit the word length to 4.

Var reg = / ^\ d {4} $/

Explanation: it starts with four numbers and ends with these four numbers, so the length of the number is limited to four.

Note: it is also with these four numbers

At this point, the study on "how to write js regular expressions limited to 1-2 integers and at most two decimal places" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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