Is there a way to test if someone has said something in chat? [duplicate]

You cannot test for what someone has said in chat. You could however set up your own custom /trigger commands.

You can do this by first creating a "trigger" type scoreboard objective:

/scoreboard objectives add home trigger

Then enable it for whoever you want to be able to use it:

/scoreboard players enable @a home

Any player who has it enabled, even non-OPs, can now use /trigger home set or /trigger home add to manipulate their "home" scoreboard objective.

You can add a /tp @a[score_home_min=1] X Y Z on a clock to have it so anyone who does /trigger home set 1 in chat is teleported home. Follow it up with setting their home score back to 1, so they aren't constantly teleported, and re-enable the objective for them, so they can use it again.

Not in vanilla Minecraft, no. There is no way in vanilla Minecraft on a vanilla server to implement any sort of custom chat commands, or detect any sort of chat events.

In addition to the above answer, if you're using the home functionality, you might also want to repeat the steps above to create a sethome trigger, then use a command to set an armorstand there with a unique name.

See How to enable home / sethome on a Vanilla Minecraft Server

Yes, it's possible to /testfor if someone is saying something in chat but you need plugins (/testforchat). Then you put in any text that you want the player to say and then you can mess around with it.