Regular expression format for the Find command

Use the etags of Emacs to generate TAGS, to find all the. h and. CPP tried for half a day, and finally found the GNU to understand the regular format of find

Please attach the GNU find's reference address: The default regular expression format for GUN find

A brief description of the format is as follows:

• ' + '? ' \+ ': Same as regular expressions in other languages
• The characters within [] are not escaped, type references are not supported, but support ranges, such as [0-9] are correct, but cannot be replaced with [[:d Igit:]], such as [\a] means \ and a
• Supported extensions include: \w \w \> \< \b \b \ ' \ '

Here are some of the more special or noteworthy places to look at:

• The group uses the \ (and \), which seems to be not the same as the others, the general is the use of ()
• or with \| said, similar to the above, as if it is not the same as the other, the general is to use yes |
• Except for the following position, ^ there is no special meaning
  • The beginning of a regular expression
  • In the grouping identifier \ (after
  • In or identifier \| After
• In addition to the following position, $ has no special meaning
  • At the end of the regular expression
  • In the grouping identifier \ (after
  • In or identifier \| After
• Except in the following position, ' * ' + '? ' is always a special character
  • The beginning of a regular expression
  • In the grouping identifier \ (after
  • In or identifier \| After

By default, greedy mode is used, which is to return the match as long as possible.

Regular expression format for the Find command