.help "strings,substr,stridx,str" Jun86 language
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NAME
strings -- string manipulation functions available in the CL
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USAGE
.nf
str     (x)
substr  (str, first, last)
stridx  (test, str)
strldx  (test, str)
strlen  (str)
strlwr  (str)
strupr  (str)
strstr  (str1, str2)
strlstr (str1, str2)
.fi
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DESCRIPTION
The following functions are available for the manipulation of strings
within the CL.  All string positions are returned as 1-indexed values.

.ls str (x)
Converts its argument into a string.  The argument may be
boolean, integer or real.
.le
.ls substr (str, first, last)
Extracts a substring from string \fIstr\fR from index \fIfirst\fR to 
index \fIlast\fR.  The \fIfirst\fR value may be larger than \fIlast\fR, in 
which case the returned string is reversed.  The first character in the 
string is at index 1.
.le
.ls stridx (test, str)
Finds the position of the first occurrence of any character found in \fItest\fR
in the string \fIstr\fR, returning 0 if the match fails.
.le
.ls strldx (test, str)
Finds the position of the last occurrence of any character found in \fItest\fR
in the string \fIstr\fR, returning 0 if the match fails.
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.ls strlen (str)
Returns the current length of a string.  Note that the maximum length may be
obtained as the value of the expression `param.p_length'.
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.ls strlwr (str)
Converts \fIstr\fR to all lower-case characters, returns a string value.
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.ls strupr (str)
Converts \fIstr\fR to all upper-case characters, returns a string value.
.le
.ls strstr (str1, str2)
Finds the position of the first occurrence of \fIstr1\fR in \fIstr2\fR (an
exact match is required), or 0 if the match fails.
.le
.ls strlstr (str1, str2)
Finds the position of the last occurrence of \fIstr1\fR in \fIstr2\fR (an
exact match is required), or 0 if the match fails.
.le
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EXAMPLES
1. Simple function calls.

.nf
	s = str(y)			     # convert y to a string.
	s = substr  ("abcdefg", 2, 4)	     # s = "bcd"
	s = substr  ("abcdefg", 4, 2)	     # s = "dcb"
	i = stridx  ("abc", " eeboq")	     # i = 4
	i = strldx  ("/", "/path/image.imh") # i = 6
	i = strlen  ("abc")		     # i = 3
	s = strlwr  ("ABC")		     # s = "abc"
	s = strupr  ("abc")		     # s = "ABC"
	i = strstr  ("imh","imhead.imh")     # i = 1
	i = strlstr ("imh","imhead.imh")     # i = 8
.fi
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SEE ALSO
scan, radix
.endhelp