Aword in regex is a self-contained, contiguous sequence of characters consisting only of letters, numbers, or underscore
true or false

True

Explanation: Regex, referred as the regular expression is that used for searching of the pattern by being in order of the alphabets.They use the technique of the find and replace or just find for searching.

The word in the regular expression persist of the word boundary and word character are utilized for formation of the words.The word is known as the entity that has numeric underscore and the alphabetical letters.Thus the given statement is true.

explanation:

d. long term memory