le LIKE est accepté :

LIKE and NOT LIKE operators

Use LIKE to search for strings that match a predetermined pattern. Use NOT LIKE to search for strings that do not match a predetermined pattern. When you use LIKE or NOT LIKE, you can use the % or _ characters to match unknown characters in a pattern.
For example, the following expression for the Background.Color property of the Salary column displays salaries in red for employees with last names beginning with F and displays all other salaries in white:

If(emp_lname LIKE'F%',RGB(255,0,0),RGB(255,255,255))

Escape keyword   

If you need to use the % or _ characters as part of the string, you can use the escape keyword to indicate that the character is part of the string. For example, the _ character in the following filter string is part of the string to be searched for, but is treated as a wildcard:

comment LIKE ~'%o_a15progress%~'

The escape keyword designates any character as an escape character (do not use a character that is part of the string you want to match). In the following example, the asterisk (*) character is inserted before the _ character and designated as an escape character, so that the _ character is treated as part of the string to be matched:

comment like ~'%o*_a15progress%~' escape ~'*~'

NB : la balise de code PB est en minuscules [ code=pb ] (sans les espaces) et non [ code langage =PB]

Effectivement, les deux solutions fonctionnent ^^
Merci pour l'aide