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János Orcsik 2020-06-30 00:16:07 +02:00
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* [Tiếng Việt](translations/README-vn.md)
* [فارسی](translations/README-fa.md)
## What are Regular Expressions?
## What is Regular Expression?
> A regular expression is a group of characters or symbols which is used to find a specific pattern in a text.
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## 2.5 Capturing Groups
A capturing group is a group of sub-patterns that is written inside parentheses
A capturing group is a group of subpatterns that is written inside parentheses
`(...)`. As discussed before, in regular expressions, if we put a quantifier
after a character then it will repeat the preceding character. But if we put a quantifier
after a capturing group then it repeats the whole capturing group. For example,
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In regular expressions, we use anchors to check if the matching symbol is the
starting symbol or ending symbol of the input string. Anchors are of two types:
The first type is the caret `^` that check if the matching character is the first
The first type is the caret `^` that checks if the matching character is the first
character of the input and the second type is the dollar sign `$` which checks if a matching
character is the last character of the input string.