Detailed explanation of the search function of notepad++

The following tutorial column will introduce you to the search function of notepad. I hope it will be helpful to friends who need it! notepad

Search function (regular expression)

When you see this, you will definitely think there is something to learn from this! Haha, yes, the above contents are common sense that everyone knows. However, as you can see from the picture above, notepad supports three search modes:

Normal mode

• Extended mode
• Regular expression mode
• regular expression mode of notepad, like His name is the same. This mode supports regular expression search. Once we are familiar with the use of regular expressions, I believe you will fall in love with this feature of using notepad.

Commonly used expressions

Listed below are some commonly used regular expression matching symbols for the convenience of students to find and learn.

Match any character Matches the previous character 0 or more times, for example, Matches the preceding character 1 or more times, for example, Matches the preceding character 0 or 1 time, for example, Matches the previous character or group n times, for example, ##{m,n }ab{2,3}c^^ a$z$[][ab]##[^] Matches any single character except "a" and "b"\w\W\d\D##\b\B|\s\S\\\t\r\n \r\n

Characters

Description

##.

*

ab* matches "a", "ab" or "abb"

ab Matches "ab" or "abb", but not "a"

?

ab? matches "a" or "ab", but not "abb"

{n}

ab{2}c matches "abbc".

Matches the previous character or group, at least m times and at most n times (if n is empty, it means any number of times), for example,

Matches "abbc" or "abbbc"

The expression on the right side matches the beginning of a line, for example,

Matches lines starting with "a"

The expression on the left is matched at the end of a line, for example,

Matches lines ending with "z"

Matches any single character in the list, such as ,

matches "a" or "b"; [0-9] matches any single number 0-9

Matches any single character outside the list, for example, [^ab]

matches a single character, including underscores, equivalent to [A-Za-z0-9_]

matches non-single characters, equivalent to [^A-Za-z0-9_]

matches numeric characters, equivalent to [0-9]

matches non-numeric characters, equivalent to [^0-9]

Matches a word boundary (beginning or end), for example, \bhe matches "hello" but not "ahello"

Matches non-word boundaries

or operator, matches the left or right expression The formula

matches the blank format

Match non-blank characters

Match characters\

Match Tab character

Match the carriage return symbol

Match the newline symbol

Match carriage return and line feed

Marking and grouping

The above symbols are for one character or for repeating one character, however, if What should I do if there are multiple characters? We need to use grouping. Regarding grouping, we can use parentheses () to specify the grouping expression. For example: (abc)? means matching 0 or 1 abc, here A parenthesized expression is a grouping. Grouping can be divided into two forms, capturing group and non-capturing group. Capturing groups can be numbered by counting their opening brackets from left to right; non-capturing groups are groups that begin with (?) and do not capture text.  

Non-capturing group – backward assertion. For example Non-capturing group – negative forward assertion. For example, the Non-capturing group – negative backward assertion . For example, Name the captured group. Submit a name to the group for subsequent use, for example Matches the group named name.Comment – ​​Content within brackets will be ignored when matching.

Character	Description
(…)	A group of captures. The first group can be accessed via \1, the second via \2.
(?:…)	Non-capturing group.
(?=…)	Non-capturing group – forward assertion. For example, (.*)(?=ton) expression, when encountering the 'Appleton' string, will match 'Apple' .
##(?	(? Expression, when encountering the 'sir William' string, the match is 'William'.
(?!…)	(?!e) expression, when encountering 'Apple', will find every letter except 'l', Because it follows 'e'.
(?	(?, when encountering 'sir William', it will match 'William'.
(?P…)	(?PA[^\s ] )\s(?P=first) will match 'Apple Apple'. Similar to (A[^\s] )\s\1, but using a group name instead of a number .
(?=name)
(?#comment)

Careful students will surely find that in addition to the search function supporting regular expressions, notepad's replacement function also supports regular expressions. The symbols above are also applicable to substitutions.

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