How search for files using regex in linux shell script [closed]

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Suppose, I want to search for files having python in filename in it, in all sub directories of linux, from a shell script. How can I search in all locations using regex?

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Find all .py files.

find / -name '*.py'

Find files with the word "python" in the name.

find / -name '*python*'

Same as above but case-insensitive.

find / -iname '*python*'

Regex match, more flexible. Find both .py files and files with the word "python" in the name.

find / -regex '.*python.*\|.*\.py'

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If simple shell regexps will suffice, then you can use find

find /linux -name "*python*"

Otherwise, I'd say use ack (http://betterthangrep.com/)

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find / -name "python"

[filler text to meet min.]