To split a text string at a certain character, you can use a combination of the LEFT, RIGHT, LEN, and FIND functions.
In the example shown, the formula in C5 is:
=LEFT(B5,FIND("_",B5)-1)
And the formula in...

To build an email address from a first and last name, you can use a formula based on simple concatenation with help from the LEFT and LOWER functions.
In the example shown, the formula in D5 is:
=LOWER(LEFT(B5)&...

If you want to get the current workbook's full name and path without a sheet name, you can use a formula that employs several text functions to strip off the sheet name. The final result will be a text string that looks...

To remove a trailing slash from a URL or path, you can use a formula based on the LEFT and LEN functions. In the example shown, the formula in cell C6 is:
=LEFT(B5,LEN(B5)-(RIGHT(B5)="/"))
How this formula...

To convert simple text values to numbers, you can use the the VALUE function, or simply add zero as described below.
In the example shown, the formula in C5 is:
=VALUE(B5)
Background
Sometimes Excel ends up with...

To get a real date from day number, or "nth day of year" you can use the DATE function.
In the example shown, the formula in C5 is:
=DATE(2015,1,B5)
How this formula works
The DATE function build dates from...

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...

To separate text and numbers, you can use a formula based on the FIND function, the MIN function, and the LEN function with the LEFT or RIGHT function, depending on whether you want to extract the text or the number. In...

If you need to extract the first word from some text you can use a formula that uses the FIND and LEFT functions. From the example, the formula looks like this:
=LEFT(B4,FIND(" ",B4)-1)
How this formula...

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 count numbers in a range that begin with specific numbers, you can use a formula based on the SUMPRODUCT function and LEFT functions.
In the example shown, the formula in E6 is:
=SUMPRODUCT(--(LEFT(B5:B11,2)=...

If you need extract the last name from a full name in LAST, FIRST format, you can do so with a formula that uses the LEFT and FIND functions. The formula works with names in this format, where a comma and space separate...

To sum values in columns by matching matching column headers, you can use a formula based on the SUMPRODUCT function. In the example shown, the formula in J5 is:
=SUMPRODUCT(data*(LEFT(headers)=J4))
where "data" is...

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:...

If you need extract the first name from a full name, you can easily do so with the FIND and LEFT functions. In the generic form of the formula (above), name is a full name, with a space separating the first name from...