JavaScript—matching at a given index inside a string (useful for parsing/tokenizing):
• .startsWith(), .endsWith():
• .indexOf(), .lastIndexOf():
• RegExp /y and /g with .lastIndex:
Strings • Exploring JavaScript (ES2025 Edition)
Strings • Exploring JavaScript (ES2025 Edition)
Regular expressions (RegExp) • Exploring JavaScript (ES2025 Edition)
