Regular Expression match string

Content

I am looking to create a rule with a regular expression for the IF statement that matches the specific string I have provided, but accepts upper and lower case. An example of something I figured out was [e][x][a][m][p][l][e] which will find that specific order of alphanumeric characters in any case together. While this works for the most part, I know this can't be the efficient way to match a string of "example".