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TypeScript - check if string contains only digits
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In this article, we would like to show you how to check if the string contains only digits in TypeScript.
Quick solution:
xxxxxxxxxx1
const value: string = '123';2
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const result: boolean = /^\d+$/.test(value);4
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console.log(result); // true
In this example, we present how to check if the string contains only digits using regex.
Where:
\d- stands for "digit" and matches any digit character (0-9),^- matches the beginning of the string,+- matches one or more of the preceding token (in our case one or more\d),$- matches the end of the string.
Runnable example:
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// ONLINE-RUNNER:browser;2
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const number: string = '123';4
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const text1: string = 'A12';6
const text2: string = '1A2';7
const text3: string = '12A';8
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const empty: string = '';10
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const result1: boolean = /^\d+$/.test(number); // true12
const result2: boolean = /^\d+$/.test(text1); // false13
const result3: boolean = /^\d+$/.test(text2); // false14
const result4: boolean = /^\d+$/.test(text3); // false15
const result5: boolean = /^\d+$/.test(empty); // false16
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console.log(result1); // true18
console.log(result2); // false19
console.log(result3); // false20
console.log(result4); // false21
console.log(result5); // falseOutput:
xxxxxxxxxx1
true2
false3
false4
false5
false