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-## Backreferencing
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-Backreferencing is used to match same text again. Backreferences match the same text as previously matched by a capturing group. Let's look at an example:
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-**Note:** `\/` is escaped `/`character, check it out in the appendix.
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-The first captured group is (`\w+`), now we can use this group again by using a backreference (`\1`) at the closing tag, which matches the same text as in captured group `\w+`.
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-You can backreference any captured group by using `\group_no`.
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-Let's have two more examples:
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-### Backreferencing and character class
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Backreferencing
-Backreferencing can not be used in character class. Let's see an example:
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Backreferencing is used to match same text again. Backreferences match the same text as previously matched by a capturing group. Let's look at an example:
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-### Backreferencing and quantifiers
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Note:\/ is escaped /character, check it out in the appendix.
-When we are using a backreference for an expression with quantifiers, then we have to be careful. Let's observe it:
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The first captured group is (\w+), now we can use this group again by using a backreference (\1) at the closing tag, which matches the same text as in captured group \w+.
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You can backreference any captured group by using \group_no.
-Note that `(\d)+` and `(\d+)` both are different. So, what will happen for `(\d)+ -- \1` expression and same text above?
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Let's have two more examples:
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-Can you observe something?
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-For `(\d)+ -- \1` expression and `123 -- 3` string, first time 1 was stored in \1, then 2 was stored in \1 and at last 3 was stored. So, it will show a match if and only if the last character before ` --` is exactly same as the character after `-- `.
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Backreferencing and character class
-**Problems:**
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Backreferencing can not be used in character class. Let's see an example:
-1. Match any palindrome string of length 6, having only lowercase letters.
- Answer: `([a-z])([a-z])([a-z])\3\2\1`
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When we are using a backreference for an expression with quantifiers, then we have to be careful. Let's observe it:
- Answer:
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-**Note:** For group numbers more than 9, there is a syntax difference.
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Note that (\d)+ and (\d+) both are different. So, what will happen for (\d)+ -- \1 expression and same text above?
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Can you observe something?
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For (\d)+ -- \1 expression and 123 -- 3 string, first time 1 was stored in \1, then 2 was stored in \1 and at last 3 was stored. So, it will show a match if and only if the last character before -- is exactly same as the character after --.
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Problems:
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Match any palindrome string of length 6, having only lowercase letters.
+ Answer: ([a-z])([a-z])([a-z])\3\2\1