| 1 | export const REGEX_HEX_PREFIXED = /^0x[\da-fA-F]+$/;
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| 2 | export const REGEX_HEX_NOPREFIX = /^[\da-fA-F]+$/;
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| 3 | /**
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| 4 | * @name isHex
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| 5 | * @summary Tests for a hex string.
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| 6 | * @description
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| 7 | * Checks to see if the input value is a `0x` prefixed hex string. Optionally (`bitLength` !== -1) checks to see if the bitLength is correct.
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| 8 | * @example
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| 9 | * <BR>
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| 10 | *
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| 11 | * ```javascript
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| 12 | * import { isHex } from '@polkadot/util';
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| 13 | *
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| 14 | * isHex('0x1234'); // => true
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| 15 | * isHex('0x1234', 8); // => false
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| 16 | * ```
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| 17 | */
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| 18 | export function isHex(value, bitLength = -1, ignoreLength) {
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| 19 | return (typeof value === 'string' && (value === '0x' ||
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| 20 | REGEX_HEX_PREFIXED.test(value))) && (bitLength === -1
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| 21 | ? (ignoreLength || (value.length % 2 === 0))
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| 22 | : (value.length === (2 + Math.ceil(bitLength / 4))));
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| 23 | }
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