###### tags:`Sharing` `RegExp` `A30:換你來手刻`

# 正規表達式(Regular Expression, regex)


:::danger
無法理解最後的 "i" 代表的意思?
`const regex = new RegExp(searchInput.value, 'i')`
:::

:::info
:point_right: [JavaScript RegExp Reference](https://www.w3schools.com/jsref/jsref_obj_regexp.asp)

參考上方網頁得知 "i" 為修飾符 (Modifier)，代表的內容為搜索值不分區域大小寫皆會成立。

| Modifier | Description |
|:--------:| --------------------------------- |
| i | Perform case-insensitive matching |
| g | Perform a global match (find all matches rather than stopping after the first match) |
| m | Perform multiline matching |

:::

:::success
case-insensitive >> case 為字母意思，insensitive 不敏感，合併起來為不分區域大小寫。下方為反向解說
:::

:::info
其他參考:
[[JS] 正則表達式(Regular Expression, regex)](https://pjchender.github.io/2017/09/26/js-%E6%AD%A3%E5%89%87%E8%A1%A8%E9%81%94%E5%BC%8F-regular-expression-regex/)
:::