= INSTR( text, searched [, start] )

This function can be called to search through strings for individual characters or sub-strings: it allows you to search for all instances of one string inside another. The string is searched for the first occurrence of the second strings. If it is found, its location will be reported in the form of the number of characters from the left-hand side of the searched string. If the search is unsuccessful, a result of zero will be given.

Normally, the search will begin from the first character at the extreme left-hand side of the host string, but you can specify an (optional) number of characters from the beginning of the searched string. The optional start-of-search position can range from one to the maximum number of characters in the searched string to be searched.

  x = INSTR( "ugBASIC", "A" )
  x = INSTR( "ugBASIC", "A", 2 )

See also the following example files:

• strings_instr_01.bas
• strings_instr_02.bas

 Ist

• Atari (400/800)
• Atari XL/XE
• Commodore 128 (MOS 8502)
• Commodore 128 (Zilog Z80)
• Commodore 64
• TRS-80 Color Computer
• TRS-80 Color Computer 3
• ColecoVision
• Amstrad CPC 664
• Dragon 32
• Dragon 64
• Thomson MO5
• Thomson MO5
• Olivetti Prodest PC128
• Commodore PLUS/4
• SEGA SC-3000
• SEGA SG-1000
• VG-5000
• Commodore VIC-20
• ZX Spectrum 48

If you have encountered a problem using this command, if you think there is a bug or the explanation is unclear, please open an issue for this keyword on GitHub. Thank you!