How to use the quantifier {n _ r _ m} in regular expressions

This article mainly introduces how to use the quantifier {nmagnetic m} in the regular expression, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let the editor take you to understand it.

Regular expression {ndirection m} quantifier:

The quantifier can repeat the previously matched character nmai m times, at least n times, and up to m times.

Grammatical structure:

Constructor mode:

New RegExp ("x {n ·m}")

Object direct quantity method:

/ x {n,m} /

Browsers support:

IE browsers support this metacharacter.

Firefox browser supports this metacharacter.

Google browser supports this metacharacter.

Example code:

Example 1:

Var str= "100pr 1000 or 10000"; var reg=new RegExp ("\ d {3pr é 4}", "g"); console.log (str.match (reg))

The above code can match 3 or 4 digits.

Example 2:

Var str= "100pr 1000 or 10000"; var reg=/\ d {3pm 4} / gscape console.log (str.match (reg))

The function of this code is the same as the above code. It's just a different definition of regularity.

It is recommended that when you are learning, it is easy to check the results through this JavaScript regular expression online testing tool.

Look at the effect above, the three numbers only match 1000, and only 3-4 numbers, even if it's too little.

Thank you for reading this article carefully. I hope the article "how to use the quantifier {nmagnetic m} in regular expressions" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!