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  5. RegExp
  6. RegExp.prototype.exec()
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RegExp.prototype.exec()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..

exec() . null.

, , RegExp.prototype.test(), String.prototype.search().

In this article

regexObj.exec(str)

str

, .

, exec() . , , .

, exec() null.

:

js
//    , ,     ,
//     .     .
//   .
var re = /,\s().+?()/gi;
var result = re.exec(",  ,   ,  .");

:

/
result [0] . ,
[1], ...[n] , . . [1] =
[2] =
index , . 9
input . , , , .
re lastIndex , . "g", . 31
ignoreCase , "i". true
global , "g". true
multiline , "m". false
source . ,\s().+?()

:

"g", exec() . , str, lastIndex ( test() lastIndex). , , :

js
var myRe = /*/g;
var str = "";
var myArray;
while ((myArray = myRe.exec(str)) !== null) {
  var msg = " " + myArray[0] + ". ";
  msg += "     " + myRe.lastIndex;
  console.log(msg);
}

:

js
 .      3
 .      9

: ( RegExp) while; , lastIndex . , , .

: exec()

exec() RegExp:

js
var matches = /( \S+)/.exec("  !");
console.log(matches[1]);

!.

Specification
ECMAScript 2027 LanguageSpecification
# sec-regexp.prototype.exec

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  2. RegExp
    1. RegExp()
    1. escape()
    1. RegExp.$1-$9
    2. RegExp.input ($_)
    3. RegExp.lastMatch ($&)
    4. lastParen ($+)
    5. leftContext ($`)
    6. rightContext ($')
    7. [Symbol.species]
    1. compile()
    2. RegExp.prototype.exec()
    3. RegExp.prototype.test()
    4. RegExp.prototype.toString()
    5. [Symbol.match]()
    6. [Symbol.matchAll]()
    7. [Symbol.replace]()
    8. RegExp.prototype[@@search]()
    9. RegExp.prototype[@@split]()
    1. RegExp.lastIndex
    2. dotAll
    3. RegExp.prototype.flags
    4. RegExp.prototype.global
    5. hasIndices
    6. RegExp.prototype.ignoreCase
    7. RegExp.prototype.multiline
    8. RegExp.prototype.source
    9. RegExp.prototype.sticky
    10. RegExp.prototype.unicode
    11. unicodeSets
  9. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
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    1. Function.displayName
    2. Function.length
    3. Function.name
    4. prototype
    5. Function.arguments
    6. Function.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
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    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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