the syntax for regular expressions is too complex to summarize the common syntax for 14, as follows:
1. \b Metacharacters to match the beginning and end of a word
2.: metacharacters, matches any character except newline characters
3. * Meta-characters, match * Previous content, continuous re-use any time
4. \d metacharacters, matching any number
5. \s metacharacters, matching any whitespace characters, including spaces, tabs (tab), line breaks, Chinese full-width spaces, etc.
6. \w metacharacters, matching letters or numbers or underscores or kanji, etc.
7. ^ and & metacharacters, match position, start and end of match string
8. * repeat 0 or more times
+ Repeat one or more times
? repeat 0 or one time
{n} repeats n times
{n,} repeats n or more times
{n,m} repeats n to M times
9. [], match any of the characters in [], such as [ABCD] matches any one of the a,b,c,d
[A-z0-9a-z], []-match from previous character to after
11. {}, representing the number of previous characters
\w matches any characters that are not letters, numbers, underscores, kanji
\s matches any character that is not a white letter
\d matches any non-numeric character
\b match is not where the word starts or ends
[^x] matches any character except X
[^aeiou] matches any character except the letters AEIOU
a.*b greedy match, match the maximum string that matches the condition, such as AAA_BWEWQEB, matches not aaa_b is all characters
a.*?b Lazy match, match the minimum string that meets the criteria, ibid.
Common regular syntax for the Android development series
