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[doc] Adding explicit link to PCRE syntax #31463

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[doc] Adding explicit link to PCRE syntax #31463

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[doc] Adding explicit link to PCRE syntax 
Following a suggestion by @StefanKarpinski [on discourse](https://discourse.julialang.org/t/questions-ss-about-function-import-and-type-parsing-ocaml-code-importing-compiling-and-regex-syntax/22241/10), I added the link to the regex syntax description.
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@tlienart
tlienart committed Mar 24, 2019
commit 3aaabff0042c2de8f64c78540f1295a710fb8a89
2 changes: 1 addition & 1 deletion doc/src/manual/strings.md
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Expand Up @@ -747,7 +747,7 @@ are given in the [Metaprogramming](@ref) section.
## Regular Expressions

Julia has Perl-compatible regular expressions (regexes), as provided by the [PCRE](http:https://www.pcre.org/)
library. Regular expressions are related to strings in two ways: the obvious connection is that
library (a description of the syntax can be found [here](http:https://www.pcre.org/current/doc/html/pcre2syntax.html)). Regular expressions are related to strings in two ways: the obvious connection is that
regular expressions are used to find regular patterns in strings; the other connection is that
regular expressions are themselves input as strings, which are parsed into a state machine that
can be used to efficiently search for patterns in strings. In Julia, regular expressions are input
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