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I am horrible at RegEx expressions and I just don't use them often enough for me to remember the syntax between uses.
I am using grepWin to search my files. I need to do a search that will return the files that have a given string twice.
So, for example, if I was searching on the word "how", then file one would not match:
Hello
how are you today?
but file two would:
Hello
how are you today?I am fine, how are you?
Any one know how to make a RegEx that will match that?
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Method 1: Regex re. To get all occurrences of a pattern in a given string, you can use the regular expression method re. finditer(pattern, string) . The result is an iterable of match objects—you can retrieve the indices of the match using the match.
A repeat is an expression that is repeated an arbitrary number of times. An expression followed by '*' can be repeated any number of times, including zero. An expression followed by '+' can be repeated any number of times, but at least once.
Similarly, a single backslash marks the beginning of an escaped language construct, but two backslashes ( \\ ) indicate that the regular expression engine should match the backslash.
\\. matches the literal character . . the first backslash is interpreted as an escape character by the Emacs string reader, which combined with the second backslash, inserts a literal backslash character into the string being read. the regular expression engine receives the string \. html?\ ' .
something like this (depends on language and your specific task)
\(how.*){2}\ Edit: according to @CodeJockey
\^(([^h]|h[^o]|ho[^w])*how([^h]|h[^o]|ho[^w])*){2,2}$\ (it become more complicated) @CodeJockey: Thanks for comments
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