How to identify a particular pattern exists in a string using javascript?

Question

Hi i am new to programming and i would like to find if a particular pattern exists in a string.

I have a string "i am [1234@some data] some data given to [223@123some data]"

I want to check if the string contains pattern like [1234@some data] or [223@123some data] is present. So it includes square-bracket followed by one or more digits followed by one @ character followed by zero or more digits followed by one or more alphabets followed by space and one or more alphabets.

What i have tried?

const string = "i am [1234@some data] some data given to [223@123some data]"
const pattern_present = string.match((/^\d+\@+\w+$/)

This doesnt seem to work. Could someone help me with this

Why ^ and $? Use \[ and ] instead. Use /\[(\d+@[\w\s]+)]/g. You may as well use /\[([^\][]*)]/g to get all strings inside square brackets. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Aug 28, 2019 at 11:11

Wiktor Stribiżew · Accepted Answer · 2019-08-28 11:29:22Z

1

You may use

/\[(\d+@[\w\s]+)]/g

See the regex demo and the regex graph:

Note you may match any chars but [ and ] after @:

/\[(\d+@[^\][]+)]/g
        ^^^^^^

JS demo:

const string = "i am [1234@some data] some data given to [223@123some data]"
let matches = [...string.matchAll(/\[(\d+@[\w\s]+)]/g)];
console.log(Array.from(matches, m => m[0])); // Full matches with square brackets
console.log(Array.from(matches, m => m[1])); // Captures only without square brackets

answered Aug 28, 2019 at 11:29

Wiktor Stribiżew

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Comments

Klienblat Moshe · Accepted Answer · 2019-08-28 11:25:28Z

0

(\[[0-9]{1,}@[0-9a-zA-Z]{1,}\s[a-zA-Z]{1,})

so:

square-bracket is a reserved character so we use escape char \ to refer to it like a simple cahr
[0-9] it's a pattern of a digit from 0 to 9.
{1,} this is the number of appearance of what you are searching so: [0-9]{1,} means 1 digit or more.
@ is the character that you are looking
[0-9a-zA-Z]{1,} : any appearance of digits or characters
\s : that is for space
[a-zA-Z]{1,} : any appearance of characters

answered Aug 28, 2019 at 11:25

Klienblat Moshe

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Genrikh · Accepted Answer · 2019-08-28 11:33:38Z

0

For example - /[\d+@.+?]/mg For matching a few substrings you should add flag "g" and for multiline search "m"

answered Aug 28, 2019 at 11:33

Genrikh

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halfer · Accepted Answer · 2020-04-28 16:13:18Z

0

You can use the following regex:

/\[\d+@\d*[a-zA-Z]+\s[a-zA-Z]+\]/g

edited Apr 28, 2020 at 16:13

halfer

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answered Aug 28, 2019 at 11:30

Pushprajsinh Chudasama

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1 Comment

Wiktor Stribiżew Over a year ago

Why use mi? They are not useful with your pattern.

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