regex Archives - Page 4 of 10

How do I negate a test with regular expressions in a bash script?

Using GNU bash (version 4.0.35(1)-release (x86_64-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally ...

May 23, 2022
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Match linebreaks – \n or \r\n?

While writing this answer, I had to match exclusively on linebreaks instead of using the s-flag (dotall – dot matches linebreaks). The sites ...

May 23, 2022
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Regular expression to allow spaces between words

I want a regular expression that prevents symbols and only allows letters and numbers. The regex below works great, but it doesn’t allow ...

May 22, 2022
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How to find patterns across multiple lines using grep?

I want to find files that have “abc” AND “efg” in that order, and those two strings are on different lines in that ...

May 22, 2022
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Regular expression for a string that does not start with a sequence

I’m processing a bunch of tables using this program, but I need to ignore ones that start with the label “tbd_”. So far ...

May 22, 2022
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Grep regex NOT containing string

I am passing a list of regex patterns to grep to check against a syslog file. They are usually matching an IP address ...

May 22, 2022
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Regex for string not ending with given suffix

I have not been able to find a proper regex to match any string not ending with some condition. For example, I don’t ...

May 22, 2022
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How to use ‘-prune’ option of ‘find’ in sh?

I don’t quite understand the example given from the man find, can anyone give me some examples and explanations? Can I combine regular ...

May 21, 2022
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Regex to match string containing two names in any order

I need logical AND in regex. something like jack AND james agree with following strings ‘hi jack here is james‘ ‘hi james here ...

May 21, 2022
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Regex (grep) for multi-line search needed [duplicate]

This question already has answers here: How can I search for a multiline pattern in a file? (11 answers) Closed 7 months ago. ...

May 21, 2022
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