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Reference · stzString

ReplaceLeadingChar()

ReplaceLeadingChar(pcChar, :With = pcNew) -- replace the leading run only IF the leading char equals pcChar. Otherwise no-op.

Basic examples (2)

Softanza
o1 = new stzString("oooo Tunisia---")
o1.ReplaceLeadingChar("o", :With = "Hi")
# o-run becomes Hi
? o1.Content()
o1.ReplaceTrailingChar("-", :With = "!")
# dash-run becomes !
? o1.Content()
Output
Hi Tunisia---
Hi Tunisia!

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 779_content.ring(opens in a new tab)

Softanza
o1 = new stzString("oooTunisia")
o1.ReplaceLeadingChar("O", :With = "")
# case-sensitive: no match
? o1.Content()
o1.ReplaceLeadingCharCS("O", :With = "", :CS = FALSE)
# case-blind: collapsed away
? o1.Content()
Output
oooTunisia
Tunisia

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 784_content.ring(opens in a new tab)

Scope (1)

Softanza
o1 = new stzString("___VAR---")
o1.ReplaceLeadingChar("_", :With = "*")
# underscores collapsed
? o1.Content()
o2 = new stzString("___VAR---")
o2.ReplaceTrailingChar("-", :With = "*")
# dashes collapsed
? o2.Content()
Output
*VAR---
___VAR*

run on 2026-10-02 04:24 inside the library at commit 0e72e2e2c; taken from 774_content.ring(opens in a new tab)

The extensions of this method

Each extension, and whether it exists for this method; an extension that exists combines with the others (FindSTCS).

Extension
Exists
What it adds · The names
Q
yes
does what the method does, then returns the object, so the call can be chained · ReplaceLeadingCharCSQ
QQ
no
chains on the next, more specific type of object (the Q ladder)
QQQ
no
chains on the most specific type of object (the Q ladder)
QRT
no
returns the result as an object of the requested type
CS
yes
takes a case-sensitivity flag · ReplaceLeadingCharCS, ReplaceLeadingCharCSQ
ST
no
takes the position to start from (StartingAt)
IB
no
takes bounds that are included (IncludingBounds)
XT
no
the extended form: more parameters than the base method
XTT
no
yet another extension: a further extended form, after XT
Z
no
includes the position in what it returns
ZZ
no
returns positions as sections, [start, end]
W
no
selects by a condition
WF
no
selects by a condition, with the expressive keywords (@NextItem, @PreviousItem...)
D
no
takes a direction, forward or backward (Directional)
F
no
takes a function (the condition or the update is given as a function); the forms document also uses F for the future form, which defers the action
Many
no
works on a collection of items instead of one (the plural form)
Except
no
takes exceptions, what to leave out (the exceptional form)
U
no
returns the result without duplication

Every example is a test file of the library, run inside the library for this page; only those whose output kept every promise their file wrote are shown.

See also