as a numeric constant: <code>\x</code> followed by exactly two hexadecimal
digits; <code>\u</code> followed by exactly four hexadecimal digits;
<code>\U</code> followed by exactly eight hexadecimal digits, and a
plain backslash <code>\</code> followed by exactly three octal digits.
In each case the value of the literal is the value represented by
the digits in the corresponding base.
</p>

<p>

accessors.\n\nThe serialization format is:\n\n``` <quantity>        ::= <signedNumber><suffix>\n\n\t(Note that <suffix> may be empty, from the \"\" case in <decimalSI>.)\n\n<digit>           ::= 0 | 1 | ... | 9 <digits>          ::= <digit> | <digit><digits> <number>          ::= <digits> | <digits>.<digits> | <digits>. | .<digits> <sign>            ::= \"+\" | \"-\" <signedNumber>    ::= <number> | <sign><number> <suffix>          ::= <binarySI> | <decimalExponent> | <decimalSI> <binarySI>        ::=...

accessors.\n\nThe serialization format is:\n\n``` <quantity>        ::= <signedNumber><suffix>\n\n\t(Note that <suffix> may be empty, from the \"\" case in <decimalSI>.)\n\n<digit>           ::= 0 | 1 | ... | 9 <digits>          ::= <digit> | <digit><digits> <number>          ::= <digits> | <digits>.<digits> | <digits>. | .<digits> <sign>            ::= \"+\" | \"-\" <signedNumber>    ::= <number> | <sign><number> <suffix>          ::= <binarySI> | <decimalExponent> | <decimalSI> <binarySI>        ::=...

type EnvVar struct {
	// Required: Name of the environment variable.
	// When the RelaxedEnvironmentVariableValidation feature gate is disabled, this must consist of alphabetic characters,
	// digits, '_', '-', or '.', and must not start with a digit.
	// When the RelaxedEnvironmentVariableValidation feature gate is enabled,
	// this may contain any printable ASCII characters except '='.
	Name string

func http2checkWriteHeaderCode(code int) {
	// Issue 22880: require valid WriteHeader status codes.
	// For now we only enforce that it's three digits.
	// In the future we might block things over 599 (600 and above aren't defined
	// at http://httpwg.org/specs/rfc7231.html#status.codes).
	// But for now any three digits.
	//
	// We used to send "HTTP/1.1 000 0" on the wire in responses but there's

string like \"978-0321751041\" - creditcard: a credit card number defined by the regex ^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\\d{3})\\d{11})$ with any non digit characters mixed in - ssn: a U.S. social security number following the regex ^\\d{3}[- ]?\\d{2}[- ]?\\d{4}$ - hexcolor: an hexadecimal color code like \"#FFFFFF: following the regex ^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$ - rgbcolor: an RGB color code...