Regular Expressions Common Symbols description

Regular Expressions Common notation Description:

1. Is any symbol except for line break

2, \s blank symbol

3, \s any symbol other than the blank symbol

4, \w letters, numbers, underline

5. \w any symbol except letters, numbers, underscores

6, \d numerals (0----9)

7, \d any other symbol except the number

8. ^ String start

9, $ string End

10, * Match 0 to countless times (matches the letter or number in front of the symbol, etc.)

11, + match 1 to countless times (matches the letter or number in front of the symbol, etc.)

12,? Match 0 or 1 times (matches the letter or number in front of the symbol, etc.)

13, {x} repeats x times

14, {x,} repeat at least x times

15, {x, y} repeats every second to Y times

16, [] character group, representing the range of characters

17, () capturing group (sub-expression)

18, \ Escape symbols

Character groups:

? [0-9] The number 0 to the array 9 any one

? [A-z] letter A to any of the letter Z

? [^CFC] except for any one character in the letter C F C

? [\ A-\ calls] Chinese characters in any one of the Chinese characters note

? [^a-z] Any character except the letter A to the letter Z

? [^-a-c] In addition to-characters and any one character from letter A to letter Z

?   | Multi-Select branch, or relationship

? \1 \2 ... Reverse Reference < (\w) >.*</\1> Reference The result of the first capturing group, used to match the closed tag of the HTML

Regular Expressions Common Symbols description