Question

我正在尝试使用JavaScript进行正则表达式搜索，但不适用于$和+等特殊字符。

var string = "Keto After 50 $20 CPA+FS";
string.search(/Keto After 50 $20 CPA F+S/g);

我希望匹配结果为0而不是-1。

Answer 1

欢迎！

我们可能只想转义元字符：

(Keto After 50 \$20 CPA\+FS)

测试

const regex = /(Keto After 50 \$20 CPA\+FS)/gm;
const str = `Keto After 50 \$20 CPA+FS`;
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}`);
    });
}

Please see this demo for additional info.

Answer 2

您可以使用反斜杠（+----------------+-----------------+ | TABLE_NAME | SUM(TABLE_ROWS) | +----------------+-----------------+ | calls | 7533 | | courses | 179 | | course_modules | 298 | | departments | 58 | | faculties | 236 | | modules | 169 | | searches | 25423 | | sections | 532 | | universities | 57 | | users | 10293 | +----------------+-----------------+）来转义这些特殊字符：

此外，您的正则表达式中有一个错字。我想您是要匹配“ ... CPA + FS”，而不是“ ... CPA F + S”。

Answer 3

特殊字符前应加反斜杠。在JavaScript正则表达式中，以下字符是特殊的：

[ \ ^ $ . | ? * + ( )

因此您的代码应如下：

var string = "Keto After 50 $20 CPA+FS";
string.search(/Keto After 50 \$20 CPA\+FS/g);

正则表达式搜索失败，带有特殊字符

3 个答案:

测试

Please see this demo for additional info.