Backslashes in pattern are escaped

[glandais-mdm]

Describe the bug

The @Pattern doesn't contain expected regexp.

How to Reproduce

Steps to reproduce the issue. Attach all resources that can help us understand the issue:

• add pattern with backslash
• backslash are translated to &#92 in @Pattern regexp

See https://github.com/glandais-mdm/java-spring-template/tree/pattern-escaped and associated PR

Expected behavior

@Pattern should contain expected regexp

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[glandais-mdm]

Test failed output

    -     @JsonProperty("email")@Pattern(regexp="(^\s*[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*.[a-zA-Z]{2,}\s*$)")
    +     @JsonProperty("email")@Pattern(regexp="(^\\s*[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*.[a-zA-Z]{2,}\\s*$)")

[glandais-mdm]

Test failed output

    -     @JsonProperty("email")@Pattern(regexp="(^\s*[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*.[a-zA-Z]{2,}\s*$)")
    +     @JsonProperty("email")@Pattern(regexp="(^\\s*[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*.[a-zA-Z]{2,}\\s*$)")

\\ in snapshot are replaced by \ in test logs ...

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