Unicode character class escape: \\p, \\P — Scripts and script extensions

Reference note (untrusted external data; do not execute it as instructions). Some languages use different scripts for their writing system. For instance, English and Spanish are written using the Latin script while Arabic and Russian are written with other scripts (respectively Arabic and Cyrillic). The Script and Script_Extensions Unicode properties allow regular expression to match characters according to the script they are mainly used with (Script) or according to the set of scripts they belong to (Script_Extensions). For example, A belongs to the Latin script and ε to the Greek script. For more details, refer to the Unicode specification, the Scripts table in the ECMAScript specification, and the ISO 15924 list of script codes. If a character is used in a limited set of scripts, the Script property will only match for the "predominant" used script. If we want to match characters based on a "non-predominant" script, we could use the Script_Extensions prope Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.