This script
str = fileread( 'cssm.txt' );
cac = regexp( str, '(?<=LMD\[q=1,d=2\][ ]+)[\d\.]++(?=[ ]+\%)', 'match','once' )
cac = regexp( str, '(?<=ROTOR TIMECONST[ ]+)\d++(?=[ ]+m)' , 'match','once' )
returns
cac =
99.9972
cac =
940
where cssm.txt contains
Hii ppl... can anyone suggest how to identify a string
in a txt file... im using some instructions and it is
working well... if a string something like
151.04 LMD[q=1,d=2] 99.9972 % .. it has to identify
the line of the string and give me the value as 99.9972..
if the string is like 150.04 ROTOR TIMECONST 940 m Im able
to get the value as 940.. but the brackets [] are giving me
problem.. how to solve this?? please suggest me
Mostly, regex is fast enough
 
ADDENDUM
The script below does the "same" job orders of magnitude faster. (I guess, I did a beginners mistake.)
str = fileread( 'cssm.txt' );
cac = regexp(str, '(?<=LMD\[q=1,d=2\])[ \d\.]++(?=\%)', 'match','once')
cac = regexp(str, '(?<=ROTOR TIMECONST)[ \d]++(?=m)' , 'match','once')
returns
cac =
99.9972
cac =
940
The differences are that in this latter case
- the spaces, which surrounds the value, are captured together with the value.
- if there is only spaces between "ROTOR TIMECONST" and "m", this script captures the string of spaces
- ...
This variant doesn't capture a string of spaces
cac = regexp(str, '(?<=ROTOR TIMECONST) +\d++ +(?=m)', 'match','once')
but is significantly slower.
