If want to extract the domain from an email address, you can do so with a formula that uses the RIGHT, LEN, and FIND functions. In the generic form above, email represents the email address you are working with.
In the...

To test if a cell (or any text string) contains a number, you can use the FIND function together with the COUNT function. In the generic form of the formula (above), A1 represents the cell you are testing. The numbers...

To remove the protocol (i.e. http://, ftp://, etc.) and trailing slash from a URL, you can use a formual based on the MID, FIND, and LEN functions. In the example shown, the formula in C5 is:
=MID(B5,FIND("//...

If you want to get the sheet name only (i.e. the sheet name without the file name or path) you can do so with rather long formula that uses the MID function along with the FIND function. The final result will look...

If you have worksheet that contains text dimensions (i.e. "50 ft x 200 ft" etc.) you can split the into two parts with formulas that use several text functions.
Background
A common annoyance with data is that it may...

To lookup the latest file version in a list, you can use a formula based on the LOOKUP function together with the ISNUMBER and FIND functions. In the example shown, the formula in cell G7 is:
=LOOKUP(2,1/(ISNUMBER(...

To allow only values that contain a specific text string, you can use data validation with a custom formula based on the FIND and ISNUMBER functions.
In the example shown, the data validation applied to C5:C9 is:
=...

Note: Excel contains many built-in "presets" for highlighting values with conditional formatting, including a preset to highlight cells that begin with specific text. However, if you want more flexibility, you can use...

If you want to get the workbook path (directory) only, you can do so with a formula that uses the LEFT and the FIND function. The result will look something like this:
Drive:\path\to\file\ //Windows
Drive:path:to:...

To extract words that begin with a specific character, you can use a formula based on six functions: TRIM, LEFT, SUBSTITUTE, MID, LEN, and REPT. This approach is useful if you need to extract things like a Twitter user...

If you need extract the last name from a full name, you can do so with this rather complex formula that uses several functions. In the generic form of the formula (above), name is a full name, with a space separating...

If you want to highlight rows in a table that contain specific text, you use conditional formatting with a formula that returns TRUE when the the text is found. The trick is to concatenate (glue together) the columns...

If want to extract the name part of an email address, you can do so with a formula that uses the LEFT and FIND functions. In the generic form above, email represents the email address you are working with.
In the...

To remove a file extension from a file name, you can use a formula based on the LEFT and FIND functions. In the example shown, the formula in C5 is:
=LEFT(B5,FIND(".",B5)-1)
How this formula works
The core...

If you want to extract the domain name from a complete URL, you can do so with a formula that uses the the LEFT and FIND functions. In the generic form above, url is the the URL you are working with.
In the example, we...