Read from file, compare string and return a part

Question

Hello, is there a reasonable good way to read text file containing information, and if string comparison is successfull, return a nother part of the string.
What i have done so far:
set file_name to (path to desktop as text) & "filename.txt"
set F to open for access tiedosto with write permission
set file_information to (read F)
close access F
(i will be moving this to Application Support/Appname/ when i figure it out).
The data in the file is in following format
12234567890Name1
98765432123Name2
92347928347Name3
What im stuck now is:
I need to compare each line the 10 numbers with search string, if match is found, the name part should be returned.
Any idea's?

Answer 1

You already read in the text file, so you need to put the data thru a repeat loop:
repeat with name_part in paragraphs of file_information
-- ((character 1 thru 10 of name_part) as string) is the first 10 digits of name part
if ((character 1 thru 10 of name_part) as string) is search_string then return name_part
end