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String Functions
By Richard Rost   Richard Rost on Twitter Richard Rost on LinkedIn Email Richard Rost   4 months ago

Access String Functions: Left, Right, Mid, Len, InStr

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In this video I will teach you how to use the string functions in Microsoft Access to make sure users are entering valid part numbers according to a set of rules. We will learn about the Left, Right, Mid, Len, and InStr functions.

Zoe from Great Falls, Montana (a Platinum Member) asks: When placing an order with our primary supplier, we have to make sure the part number is valid. They have a gigantic database of parts, and it changes constantly, so looking up each part number isn't practical. They do, however have a specific format for all of their part numbers. If I could just make sure my users are typing the part numbers in the correct format, that would eliminate 99% of my problems. I import most of this data from Excel sheets, so I can't use an Input Mask. You wouldn't believe the junk I have to correct! Can you help me, please!?

Part Number Rules: Has to start with the letter P. The right 3 characters have to be a number greater than 100. The 5th character has to be a hyphen. The whole string has to be exactly 9 characters long. The letter X must be included somewhere in the string.


Members will learn how to use the string functions in VBA to make sure users are entering in valid passwords. We will learn how to do a binary search (to tell capital from lowercase letters) with Option Compare Binary or StrComp function, and to determine if a string contains ANY character from an allowed list. We'll write our own IsFound function - is any character from string 1 found inside of string 2.

Leon from Bismark, North Dakota (a Gold Member) asks: I created a form allowing my employees to change their password. They must enter their current password and then create a new password, and verify the password by entering it twice. I check that the new password is not the same as the current password. I want to include all the parameters that strengthens the password. I appreciate your help. 

Password Rules: The first character has to be a capital letter. The password must contain both capital and lowercase letters, plus at least one numeric digit and one special character: !-_#$@%+

Silver Members and up get access to an Extended Cut of this video. Gold Members can download the database template from class plus get access to the Code Vault. If you signed up on YouTube you have to contact me so I can set up your account here on my web site. If you're not a member, Join Today!


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microsoft access, ms access, #msaccess, #microsoftaccess, #help, #howto, #tutorial, #instruction, #learn, #lesson, #training, #database, left, right, mid, len, instr, strcomp, part numbers, change passwords, option compare binary, capital, lowercase, numeric, digits, one string found inside another, isfound, any character found in a string, allowed characters list


Password Video Upload Images   Link 
Leon Heick 
3 months ago
I sent a question to you about a month ago asking you if their was a video about creating a password that requieres an uppercase, lowercase, special character and a length of 8 or more characters. You created a video with my question from Leon in Bismarck ND. It was about a 40 minute video. You commented that the video should have only taking 15 minutes but you needed to find a bug in the code. This video explained exactly what I wanted. Please point me in the right direction so I can find this video and code vault on your web page. Thank you.
Kevin Robertson
3 months ago
String Functions
Richard Rost
3 months ago
If you were to search my site for "Leon" or "Bismarck" you would have found it in the search results. :)
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Keywords: TechHelp Access left, right, mid, len, instr, strcomp, part numbers, change passwords, option compare binary, capital, lowercase, numeric, digits, one string found inside another, isfound, any character found in a string, allowed characters list  PermaLink