Bugfix | 1495 regexp escape string

[AlexNDRmac]

Hello!

• Type: bug fix
• Link to issue: 1495

In raising this pull request, I confirm the following:

• I have checked that another pull request for this purpose does not exist

• I wrote some tests for this PR

• I updated the CHANGELOG

• Added slashes for regex string when generate C-code

• Added tests

Thanks

[codecov]

Codecov Report

Merging #1969 into development will decrease coverage by <.01%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##             development    #1969      +/-   ##
=================================================
- Coverage          31.01%   31.01%   -0.01%     
  Complexity          8260     8260              
=================================================
  Files                561      561              
  Lines              46870    46871       +1     
=================================================
  Hits               14538    14538              
- Misses             32332    32333       +1

[sergeyklay]

Thank you

[mruz]

let e = "\e"

is escaped now

-ZVAL_STRING(&e, "\e");		
+ZVAL_STRING(&e, "\\e");

so colors in ice console stopped working
https://github.com/ice/framework/blob/3667503adc7efb128ed8d56e46b0ef9b0e24577e/build/php7/ice/cli/console.zep.c#L289