check if cell only has letter "M", not "MS" or others

currently i use code to check for values that start with certain strings, but problem arouse when i was looking for cells that started with the letter "M". I have multiple instances of the letter "M" with can be followed by other letters. can i find only the one cell that starts with only the letter m followed by no other letters? An Example of two cells would be
MS301445
MP113555
M443229 this one being the one i want.
the numbers change all the time but the format of it does not.

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ok i tested code and i had to make some changes. why wont it do the code following the test? i bet its right in front of me...

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wow... 1 does not equal true. I knew it was in front of me!