One-or-more quantifier
A one-or-more quantifier is a regular-expression quantifier that requires the preceding element or group to occur at least once, with additional occurrences permitted.
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A one-or-more quantifier is a regular-expression quantifier requiring the preceding element or group to occur at least once.
- How it is used
- Uses + to recognize repeated consonants, digits, word characters, and separators while building practical regular-expression solutions.
- How deep it goes
- Defines the quantifier and demonstrates successful, failed, captured, and split matches without examining regex-engine internals.
- Examples
- Demonstrates consonants in chair, digits in abc123!, word characters, vowel-word groups, and punctuation in a sentence.
- What you can do after
- Apply it via Python's re module to require and capture one or more consecutive characters or groups.
The Quick Python Book, Fourth Edition
A one-or-more quantifier requires the preceding regular-expression element to occur at least once and permits additional occurrences.
- How it is used
- Uses `+` to require nonempty repeated portions when extracting names and matching structured text.
- How deep it goes
- Defines immediate-predecessor repetition and demonstrates character-class matching, but does not develop engine internals.
- Examples
- Demonstrates names, hyphenated names, overmatching strings, and Python `re` patterns for contact records.
- What you can do after
- Apply the quantifier in Python `re` patterns to match one or more characters or repeated subpatterns.
Read how The Quick Python Book, Fourth Edition explains one-or-more quantifier →
Related concepts
- regular expressionconfigures · A formal pattern notation that describes sets of strings and enables text to be matched, searched, extracted, or transformed.
- quantifierkind of · A regular-expression quantifier is syntax that specifies how many times a preceding pattern element may or must match.
- plus operatorcontrasts with · The plus operator is a language-defined operation, commonly performing numeric addition, string concatenation, or collection combination according to operand types.
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