How to find out if a string contains a specific string in it?

Hey,

what should I use in a conditional statement in order to execute a command only on observations whose string variable (their name) contains a specific phrase?
For example, I'm looking for something like:

Code:

replace var = x if name _____________

where the "______________" part should check if a specific sequence of letters I'll define is part of name.

Thanks in advance,
Ben