How to use regular expression (regex) in grep or vi?
Wednesday, July 8, 2009
How to use regular expression (regex) in grep or vi?
If you need to search for a pattern of "string" or "character" in a file / many files, you will need to use regular expression (regex) either in vi editor or in grep command. But how? See below:
using vi:
- press '/' for searching
- for instance, i wanted to search for CL000, CL001, CL002, ie: the pattern is CLXXX follow by digit.
- syntax:
/^CL[0-9]*
^ - start of pattern
* - zero or more digit
using unix grep command:
- grep CL[0-9]
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