用于匹配特定字符串和范围内数字的组合的正则表达式是什么？

Question

匹配特定字符串和范围内数字的组合的正则表达式是什么？

例如

它只能与iOS8，iOS9，iOS10，iOS11，iOS12，iOS13匹配

string-iOS | 范围-8到13

Answer 1

此表达式仅与列出的所需iOS版本匹配：

iOS[89]|iOS[1][0-3]

Demo

测试

const regex = /iOS[89]|iOS[1][0-3]/gm;
const str = `iOS7
iOS8
iOS9
iOS10
iOS11
iOS12
iOS13
iOS14`;
let m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}

对于iOS1到iOS213，例如，以下表达式可能有效，并且如果要进行验证，我们将添加开始和结束锚点：

^iOS[2][1][0-3]$|^iOS[2][0]\d$|^iOS[1][0-9][0-9]$|^iOS[1-9][0-9]$|^iOS[1-9]$

Demo 2

const regex = /^iOS[2][1][0-3]$|^iOS[2][0]\d$|^iOS[1][0-9][0-9]$|^iOS[1-9][0-9]$|^iOS[1-9]$/gm;
const str = `iOS0
iOS7
iOS8
iOS9
iOS10
iOS11
iOS12
iOS13
iOS14
iOS200
iOS201
iOS202
iOS203
iOS205
iOS214`;
let m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}

Answer 2

一种更简单的方法是提取数值并与最小值和最大值进行比较：

var arr = ['iOS0','iOS1','iOS8','iOS12', 'iOS15', 'abc123']

console.log(arr.map(function (s) {
    if (m = s.match(/^iOS(\d+)$/)) {
        if (m[1] > 7 && m[1] < 14) {
            return s + " --> match";
        } else {
            return s + " --> no match";
        }
    } else {
        return s + " --> no match";
    }
}));