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(adding 0 forces $2 to be interpreted as a number). Some regular expression symbols provide a repetition rate called a 'multiplier.' The most common are: + (one or more) \d+ is 'one or more digits', a pattern that corresponds to each positive decimal integer (zero or greater). Or use a tool such as AWK to match the numerical value: awk '$2+0 = 1 ' data_file.txt This will still match “-1.0”, since “-” is a non-word character if that’s a problem, you can extend the pattern and stop looking for words: grep -c ' 1\.0$' data_file.txt You don’t need to involve wc either, since you’re only interested in one match per line, and grep can count lines: grep -cw '1\.0' data_file.txt in “11.002”), you should ask grep to only match words: grep -wo '1\.0' data_file.txt | wc -l Removing arbitrary whitespaces and tabs (Back to top) In this example we 2. If you want to only count 1.0 as values, and not substrings ( e.g. Or “escape” the period so it matches a period: grep -o '1\.0' data_file.txt | wc -l To accurately count “1.0” occurrences, you should ask grep to search for fixed strings: grep -Fo 1.0 data_file.txt | wc -l Instructions here are written for TextWrangler on a Mac but can be easily adapted for Notepad++ on Windows. There are three regular expression operators within Perl. The first operator is a test and assignment operator. In your example, the line 1EU1 0.8915343915343915 The basic method for applying a regular expression is to use the pattern binding operators and. Go to Notepad++ Regular Expressions Examples website using the links below Step 2. Grep uses regular expressions by default, and “1.0” is a regular expression matching “1” followed by any character followed by “0”.