RegExp.prototype.ignoreCase has the value true if the i flag was used; otherwise, false. The i flag indicates that case should be ignored while attempting a match in a string.

If the regex has the unicode flag, the case mapping happens as specified in CaseFolding.txt. Otherwise, case mapping uses the Unicode Default Case Conversion — the same algorithm used in String.prototype.toUpperCase() and String.prototype.toLowerCase().

The set accessor of ignoreCase is undefined. You cannot change this property directly.

• RegExp.prototype.lastIndex
• RegExp.prototype.dotAll
• RegExp.prototype.global
• RegExp.prototype.hasIndices
• RegExp.prototype.multiline
• RegExp.prototype.source
• RegExp.prototype.sticky
• RegExp.prototype.unicode