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StartOfString—Wolfram Documentation

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StartOfString

represents the start of a string for purposes of matching in StringExpression.

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StartOfString

StartOfString

represents the start of a string for purposes of matching in StringExpression.

Examples

Basic Examples  (3)

Test whether a string starts with an "a":

Wolfram Language code: StringMatchQ["abaababba", StartOfString ~~ "a" ~~ __]

Replace the first letter in a string:

Wolfram Language code: StringReplace["ababbabbaaab", StartOfString ~~ LetterCharacter -> "t"]

Remove the leading spaces:

Wolfram Language code: StringReplace[" Have a nice day. ", (StartOfString ~~ Whitespace) -> ""]//FullForm
Wolfram Research (2004), StartOfString, Wolfram Language function, https://reference.wolfram.com/language/ref/StartOfString.html.

Text

Wolfram Research (2004), StartOfString, Wolfram Language function, https://reference.wolfram.com/language/ref/StartOfString.html.

CMS

Wolfram Language. 2004. "StartOfString." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/StartOfString.html.

APA

Wolfram Language. (2004). StartOfString. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/StartOfString.html

BibTeX

@misc{reference.wolfram_2026_startofstring, author="Wolfram Research", title="{StartOfString}", year="2004", howpublished="\url{https://reference.wolfram.com/language/ref/StartOfString.html}", note=[Accessed: 14-November-2026]}

BibLaTeX

@online{reference.wolfram_2026_startofstring, organization={Wolfram Research}, title={StartOfString}, year={2004}, url={https://reference.wolfram.com/language/ref/StartOfString.html}, note=[Accessed: 14-November-2026]}