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@ -349,7 +349,6 @@ character.
<pre> <pre>
"(f|c|m)at\.?" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> sat on the <a href="#learn-regex"><strong>mat.</strong></a> "(f|c|m)at\.?" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> sat on the <a href="#learn-regex"><strong>mat.</strong></a>
</pre> </pre>
[Test the regular expression](https://regex101.com/r/DOc5Nu/1) [Test the regular expression](https://regex101.com/r/DOc5Nu/1)
## 2.8 Anchors ## 2.8 Anchors
@ -421,7 +420,7 @@ regular expressions:
Lookbehinds and lookaheads (also called lookarounds) are specific types of Lookbehinds and lookaheads (also called lookarounds) are specific types of
***non-capturing groups*** (used to match a pattern but without including it in the matching ***non-capturing groups*** (used to match a pattern but without including it in the matching
list). Lookarounds are used when we a pattern must be list). Lookarounds are used when want to check if a pattern is
preceded or followed by another pattern. For example, imagine we want to get all preceded or followed by another pattern. For example, imagine we want to get all
numbers that are preceded by the `$` character from the string numbers that are preceded by the `$` character from the string
`$4.44 and $10.88`. We will use the following regular expression `(?<=\$)[0-9\.]*` `$4.44 and $10.88`. We will use the following regular expression `(?<=\$)[0-9\.]*`
@ -429,6 +428,10 @@ which means: get all the numbers which contain the `.` character and are precede
by the `$` character. These are the lookarounds that are used in regular by the `$` character. These are the lookarounds that are used in regular
expressions: expressions:
<pre>
"(?<=\$)[0-9.]*" => The prices of monitors vary from $<a href="#learn-regex"><strong>10.88</strong></a> to $<a href="#learn-regex"><strong>4.44</strong></a>
</pre>
|Symbol|Description| |Symbol|Description|
|:----:|----| |:----:|----|
|?=|Positive Lookahead| |?=|Positive Lookahead|