What is the syntax of regular expressions in Go language?
The syntax of regular expressions in Go language is similar to that in other languages, but there are also some minor differences. Here are some commonly used regular expression syntax in Go language:
- Matching characters
- – Match any single character (except for a newline).
- [abc]: matches any of the characters a, b, or c.
- [^abc]: Match any character that is not the character a, b, or c.
- [a-z]: Matches any lowercase letter.
- [A-Z]: matches any capital letter
- \d: matches any digit.
- \D: Matches any non-digits character.
- \w: matches any single letter, number, or underscore
- \W: Matches any non-alphanumeric or non-underscore character.
- Repeated matches
- * : matching zero or more repetitions of the previous character
- +: match one or more repetitions of the preceding character
- Zero or one repetition of the character immediately preceding.
- {n}: Matches exactly n repetitions of the previous character.
- {n,}: matches at least n repetitions of the preceding character.
- {n,m}: Match at least n and at most m repetitions of the preceding character.
- Boundary matching
- ^: Indicates the start of a string.
- $: Matches the end of a string
- \b: matching the boundary of a word
- Grouping and capturing
- Group the content inside () to enable multiple group selections using | for matching.
- Group only, no capture.
- 1. 1, 2, etc.: Referencing the preceding group.
- escape character
- \：This is used to escape special characters, such as \. which matches a period.
In general, the regular expression syntax in Go language is concise and can be used for matching operations through functions in the regexp package.
