regular expression

Character group []

[Pp]ython can match Python python, that is, a string starting with P or p followed by python
[0-9] is OKMatch all numbers between 0-9
[0-9a-zA-Z] is to match all numbers lowercase letters uppercase letters
[^0-9] means that it will not match 0-9
[/-] Match special characters such as '-' through translation characters
When you want to match multiple special characters
For example[\[|\]|\-|\(|\)]match -----()[] Split by |
The following lowercase letters are replaced by uppercase letters, which is notThe meaning of
[\d] means all numbers [\D] means no matching numbers
[\w] means that both upper and lower case letters can be matched
[\s] means matching spaces
[\bwoaini\b] means that word boundaries will only match between words and spaces, that is, the wordWoaini will not work if it is followed by other alphanumerics. Special symbols can be

Do not add [] and write ^python directly to indicate that the python at the beginning of the matching string will not be matched again if python appears later. For example, python123python can only match the previous python

python$ means match python at the end and cannot add special symbols including spaces
. can match anything except \n
?n indicates that this n can appear or not appear
{3} indicates the number of repetitions 3
such as \d{3}-\d{5}

{3,4} means it can match 3 or 4 if it is {3,}Match more than 3 numbers
eg

+Equivalent to {1,}
*equivalent to {0,}

Extract

(\d{4})-(\d{7})The corresponding data can then be extracted