CODEWITHSUNDEEP
regex
Tony
Tony

Reputation: 3409

Regular expression value in hex

I am learning regular expression and trying to understand what value will be matched if the regex represents in hex value.

For example, if I have ^[\\x00-\\xff]{16}, does this mean that it will match any values from 0-255 for 16 digits long?

I looked on line, can't seem to find the example.

Thanks

Upvotes: 1

Views: 2213

Answers (1)

chaos
chaos

Reputation: 124297

The hexadecimal value refers to the character code of the string character being matched. For example, 'A' in ASCII or UTF-8 is 65, or x41.

^[\x00-\xff]{16} means to match, anchored at the beginning of the string, exactly 16 characters whose numeric values are between 0 and 255. If your regex engine isn't multi-byte-character-set-aware, that will mean any character, so in that case it's almost identical to ^.{16}, except that in many regex engines . won't match a newline unless a specific option is turned on (/s in Perl and Perl-compatible regex).

Upvotes: 2

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