RegexpGarden
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A pot
Primrose
A pot
AppleGalaMust696
A pot
Rosemary
A pot
RoseOfSharon
A pot
SnowInSummer
A pot
TomatoRomaVF1
A pot
Roseberry
123456
let garden = [
	"Primrose", "Apple 'Gala Must 696'", 
	"Rosemary", "Rose-of-Sharon", 
	"Snow-in-Summer", "Tomato 'Roma VF1'", 
	"Roseberry"
];
123456
for  (const plant of garden) {
if (plant.match(//i) {
cut(plant);
}
}
Lesson 18 / 42

Lesson task •

Cut plants that has one or more "'" or "-" in its name

Single character from a custom symbol class

[...]

Matches single character from the specified range of symbols

In the previous lessons we encountered several symbol classes: \w for word characters only, \s for whitespace characters only, \d for digit characters only, and their opposites. In regular expressions we are not limited by these classes but can create our own classes enumerating allowed symbols inside [ and ]. For example, /[:;]/ will match single ":" or single ";":

12345
console.log(!!":".match(/[:;]/)) // true 
console.log(!!";".match(/[:;]/)) // true 
console.log(!!"4".match(/[:;]/)) // false 
console.log(!!"f".match(/[:;]/)) // false 
console.log(!!":::".match(/^[:;]$/)) // false

Please note, that symbols forming a class are enumerated without commas.

Among enumerating symbols forming a class, we can define a range of symbols: /[0-4]/ will match any single digit from the range from 0 to 4:

123456
console.log(!!"0".match(/[0-4]/)) // true 
console.log(!!"1".match(/[0-4]/)) // true 
console.log(!!"2".match(/[0-4]/)) // true 
console.log(!!"3".match(/[0-4]/)) // true 
console.log(!!"4".match(/[0-4]/)) // true 
console.log(!!"5".match(/[0-4]/)) // false

We can also combine multiple ranges at one time:

12345678910
console.log(!!"0".match(/[0-46-9]/)) // true 
console.log(!!"1".match(/[0-46-9]/)) // true 
console.log(!!"2".match(/[0-46-9]/)) // true 
console.log(!!"3".match(/[0-46-9]/)) // true 
console.log(!!"4".match(/[0-46-9]/)) // true 
console.log(!!"5".match(/[0-46-9]/)) // false 
console.log(!!"6".match(/[0-46-9]/)) // true 
console.log(!!"7".match(/[0-46-9]/)) // true 
console.log(!!"8".match(/[0-46-9]/)) // true 
console.log(!!"9".match(/[0-46-9]/)) // true

Worth noting that in the regexp above "-" is not included in the range:

1
console.log(!!"-".match(/[0-46-9]/)) // false

If for some reason, among the digits from 0 to 4 and from 6 to 9, you need to match "-", you have to specify it at the beginning or at the end of the symbol class. When used not at the beginning or at the end, "-" forms a range:

1234567
console.log(!!"-".match(/[-0-46-9]/)) // true 
console.log(!!"-".match(/[0-46-9-]/)) // true 
console.log(!!"0".match(/[0-46-9-]/)) // true 
console.log(!!"4".match(/[0-46-9-]/)) // true 
console.log(!!"5".match(/[0-46-9-]/)) // false 
console.log(!!"6".match(/[0-46-9-]/)) // true 
console.log(!!"9".match(/[0-46-9-]/)) // true

There is no need to escape special symbols when enumerating them except backslash and square brackets itself:

123456789
console.log(!!".".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"^".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"$".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"\".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"*".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"+".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"?".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"[".match(/[.^$\\/*+?\[\]]/)) // true 
console.log(!!"]".match(/[.^$\\/*+?\[\]]/)) // true

You can also use symbol class tokens from the previous lessons inside the custom symbol class:

12345678910
console.log(!!"0".match(/[\d]/)) // true 
console.log(!!"1".match(/[\d]/)) // true 
console.log(!!"2".match(/[\d]/)) // true 
console.log(!!"3".match(/[\d]/)) // true 
console.log(!!"4".match(/[\d]/)) // true 
console.log(!!"5".match(/[\d]/)) // true 
console.log(!!"6".match(/[\d]/)) // true 
console.log(!!"7".match(/[\d]/)) // true 
console.log(!!"8".match(/[\d]/)) // true 
console.log(!!"9".match(/[\d]/)) // true

As usual, if you need to match "[" or "]" literally, consider escaping it with the backslash:

12
console.log(!!"[".match(/\[/)) // true 
console.log(!!"]".match(/\]/)) // true