Java Regular Expression (i)

The regular expression (regular expression) describes a syntax rule for string matching.

(1) Ordinary characters

The simplest regular expression is a single normal character that matches one character at a time, matching one character to the other. Ordinary characters consist of all printed and non-printable characters that are not displayed as metacharacters. Letters, numbers, Chinese characters, underscores, and punctuation that are not specifically defined are ordinary characters. This includes all uppercase a~z and lowercase A-Z, all digits 0-9, all punctuation

(2) Special characters

Special characters, which are characters with special meanings, are usually the matching characters specified in the regular expression syntax.

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Java Regular expression (i)