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stdlib/lib/node_modules/@stdlib/assert/is-hex-string at develop · stdlib-js/stdlib

isHexString

Test whether a string contains only hexadecimal digits.

Usage

var isHexString = require( '@stdlib/assert/is-hex-string' );

isHexString( value )

Tests whether a string contains only hexadecimal digits.

var bool = isHexString( '0123456789abcdefABCDEF' );
// returns true

Notes

  • For non-string values, the function returns false.
  • The function does not recognize x (as in the standard 0x prefix).

Examples

var isHexString = require( '@stdlib/assert/is-hex-string' );

var out = isHexString( '0123456789abcdefABCDEF' );
// returns true

out = isHexString( '' );
// returns false

out = isHexString( '0xffffff' );
// returns false

out = isHexString( 123 );
// returns false

CLI

Usage

Usage: is-hex-string [options] [<string>]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.

Notes

  • If the split separator is a regular expression, ensure that the split option is either properly escaped or enclosed in quotes.

    # Not escaped...
$ echo -n $'0xffffff\n0123456789abcdefABCDEF' | is-hex-string --split /\r?\n/
# Escaped...
$ echo -n $'0xffffff\n0123456789abcdefABCDEF' | is-hex-string --split /\\r?\\n/

  • The implementation ignores trailing delimiters.

Examples

$ is-hex-string 0123456789abcdefABCDEF
true

To use as a standard stream,

$ echo -n '0123456789abcdefABCDEF' | is-hex-string
true

By default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.

$ echo -n '0123456789abcdefABCDEF\t0xffffff' | is-hex-string --split '\t'
true
false

See Also