# Regular Expressions [25%] Identifier names in a hypothetical language may contain letters (A - Z and...

###### Question:

Regular Expressions

[25%] Identifier names in a hypothetical language may contain letters (A - Z and a - z), digits (0 - 9), and special symbols ($, _ , and ). Additionally, any acceptable identifier name must satisfy the following conditions: a) The first character of an identifier name must be a letter or special symbol. b) An identifier name may contain at most two special symbols. c) If an identifier name contains two special symbols, then all characters after the second special symbol must be digits, and there should be at least one such digit. Some examples of identifiers in this language are: Hellol$ag34ain 32 and 2 345ab. Some examples of illegal identifier names are: 3abc and So_what_is 3. Give a regular expression for identifier names in this language.

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