Overview > klyn.regex > RegExMatcher > start
Version 0.1.5 Overview Index Tree Deprecated
klyn.regex.RegExMatcher.start
method
public native start(index as Int = 0) as Int
Description

Returns the inclusive start offset of a captured group in the input.

Parameters
ParameterDescription
indexZero-based capture-group index. Group 0 is the full match.
Returns

The absolute start offset, or -1 for an unmatched optional group.

Throws
  • IllegalStateException if no successful match is current.
  • IndexException if the group index is invalid.
Example
matcher = RegEx(r"\d+").matcher("value=42")
if matcher.find():
print(matcher.start())  # 6