Regular expressions are extremely useful in (ad hoc) scripts and sometimes in search-replace operations in text editors (also for pure search to become more specific (fewer false positives)).
Typically one-off scripts to extract and output information from line-oriented input (even HTML). They don't need to be robust and are (usually) not maintained. They get the job done quickly and efficiently.
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Regular expressions are extremely useful in (ad hoc) scripts and sometimes in search-replace operations in text editors (also for pure search to become more specific (fewer false positives)).
Typically one-off scripts to extract and output information from line-oriented input (even HTML). They don't need to be robust and are (usually) not maintained. They get the job done quickly and efficiently.