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LEFT
Returns the specified number of characters from the beginning of a text string.
Use
LEFT(text,
num_chars) and replace text with the field
or expression you want returned; replace num_chars with the number of
characters from the left you want returned.
Tips
- Reference auto-number fields as text fields in formulas.
- If the num_chars value is less than zero, Salesforce replaces the value with zero.
TRIM(LEFT(LastName, 5)) & "-" & TRIM(RIGHT(SSN__c,
4))
This formula displays the first five characters of a name and the last four characters of a social security number separated by a dash. Note that this example uses a text custom field called SSN.

