Selecting strings with numbers and words

Hello,

I have some output that looks like :

some text I don't care about

StartValues

blah blah blah blah blah

1.word:1111

blah blah blah blah blah

2.Anotherword:247120472190

...etc

I've been trying to capture just the lines that are in the number.word:number , so I tried

[string[]]$MyVar= ($OutputString-split'StartValues')[1].split() |Select-String-Pattern$trialRegex2

 unfortunately I can't seem to get the regex correctly

I've tried

$trialRegex="(\d)^.(\w)"

$trialRegex2

='\d+^.\w+'

$trialRegex3 ='(\d+)^.(\w+)'

What am I doing wrong? Am I even supposed to be using -pattern and regex here?

Thanks in advance!