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| • Regular Expressions Overview: | Overview of Regular expression in sed
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| • BRE vs ERE: | Basic (BRE) and extended (ERE) regular expression syntax | |
| • BRE syntax: | Overview of basic regular expression syntax | |
| • ERE syntax: | Overview of extended regular expression syntax | |
| • Character Classes and Bracket Expressions: | ||
| • regexp extensions: | Additional regular expression commands | |
| • Back-references and Subexpressions: | Back-references and Subexpressions | |
| • Escapes: | Specifying special characters | |
| • Locale Considerations: | Multibyte characters and locale considrations |