In the following, a number-string is a non-empty sequence of decimal

digits, i.e., something in the language defined by the regular expression

[0-9]+. The value of a number-string is the usual interpretation of a

number-string as an integer number. Note that leading zeroes are

allowed.

Make for each of the following languages a regular expression that

describes that language.

a) All number-strings that have the value 42.

b) All number-strings that have a value that is strictly greater than

42.

In the following, a number-string is a non-empty sequence of decimal

digits, i.e., something in the language defined by the regular expression

[0-9]+. The value of a number-string is the usual interpretation of a

number-string as an integer number. Note that leading zeroes are

allowed.

Make for each of the following languages a regular expression that

describes that language.

a) All number-strings that have the value 42.

b) All number-strings that do not have the value 42.

c) All number-strings that have a value that is strictly greater than

42.