JavaScript RegExp Group [abc]
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Definition and usage
Bracket [abc] specifies the matching item within the brackets.
Square brackets can define a single character, a group, or a character range:
[abc] | Any character a, b, or c. |
[A-Z] | Any character from uppercase A to uppercase Z. |
[a-z] | Any character from lowercase a to lowercase z. |
[A-z] | Any character from uppercase A to lowercase z. |
Example
Global search for the character "h" in the string:
let text = "Is this all there is?"; let pattern = /[h]/g;
Hint
Please use [^abc] Expression finds any character not inside parentheses.
Example 1
For global search of characters "i" and "s" in the string:
let text = "Do you know if this is all there is?"; let pattern = /[is]/gi;
例子 2
全局搜索字符串中从小写 "a" 到小写 "h" 的字符:
let text = "Is this all there is?"; let pattern = /[a-h]/g;
例子 3
全局搜索从大写 "A" 到大写 "E" 的字符范围:
let text = "I SCREAM FOR ICE CREAM!"; let pattern = /[A-E]/g;
例子 4
全局搜索从大写 "A" 到小写 "e" 的字符(将搜索所有大写字母,但仅搜索从 a 到 e 的小写字母。)
let text = "I Scream For Ice Cream, is that OK?!"; let pattern = /[A-e]/g;
例子 5
对字符范围 [a-s] 进行全局、不区分大小写的搜索:
let text = "I Scream For Ice Cream, is that OK?!"; let pattern = /[a-s]/gi;
例子 6
对字符进行 "g" 和 "gi" 搜索:
let text = "THIS This this"; let result1 = text.match(/[THIS]/g); let result2 = text.match(/[THIS]/gi);
语法
new RegExp("[abc]")
或者简写:
/[abc]/
带修饰符的语法
new RegExp("[abc]", "g")
或者简写:
/[abc]/g
浏览器支持
/[abc]/
是 ECMAScript1 (ES1) 特性。
所有浏览器都完全支持 ES1 (JavaScript 1997):
Chrome | IE | Edge | Firefox | Safari | Opera |
---|---|---|---|---|---|
支持 | 支持 | 支持 | 支持 | 支持 | 支持 |
正则表达式搜索方法
在 JavaScript 中,正则表达式文本搜索可以用不同的方法完成。
使用模式(pattern)作为正则表达式,这些是最常用的方法:
ƙirarorin | ƙirarorin |
---|---|
text.match(ƙararorin) | ƙararorin ƙirarorin match() |
text.search(ƙararorin) | ƙararorin ƙirarorin search() |
ƙararorin.exec(text) | RexExp ƙararorin exec() |
ƙararorin.test(text) | RexExp ƙararorin ƙaɗaɗa test() |
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